research report writing tense

Using the right tense

In your scientific paper, use verb tenses (past, present, and future) exactly as you would in ordinary writing. Use the past tense to report what happened in the past: what you did, what someone reported, what happened in an experiment, and so on. Use the present tense to express general truths, such as conclusions (drawn by you or by others) and atemporal facts (including information about what the paper does or covers). Reserve the future tense for perspectives: what you will do in the coming months or years. Typically, most of your sentences will be in the past tense, some will be in the present tense, and very few, if any, will be in the future tense.

Work done We collected blood samples from . . . Groves et al. determined the growth rate of . . . Consequently, astronomers decided to rename . . . Work reported Jankowsky reported a similar growth rate . . . In 2009, Chu published an alternative method to . . . Irarrázaval observed the opposite behavior in . . . Observations The mice in Group A developed , on average, twice as much . . . The number of defects increased sharply . . . The conversion rate was close to 95% . . .

Present tense

General truths Microbes in the human gut have a profound influence on . . . The Reynolds number provides a measure of . . . Smoking increases the risk of coronary heart disease . . . Atemporal facts This paper presents the results of . . . Section 3.1 explains the difference between . . . Behbood's 1969 paper provides a framework for . . .

Future tense

Perspectives In a follow-up experiment, we will study the role of . . . The influence of temperature will be the object of future research . . .

Note the difference in scope between a statement in the past tense and the same statement in the present tense: "The temperature increased linearly over time" refers to a specific experiment, whereas "The temperature increases linearly over time" generalizes the experimental observation, suggesting that the temperature always increases linearly over time in such circumstances.

In complex sentences, you may have to combine two different tenses — for example, "In 1905, Albert Einstein postulated that the speed of light is constant . . . . " In this sentence, postulated refers to something that happened in the past (in 1905) and is therefore in the past tense, whereas is expresses a general truth and is in the present tense.

Choosing between active and passive voice

In English, verbs can express an action in one of two voices. The active voice focuses on the agent: "John measured the temperature." (Here, the agent — John — is the grammatical subject of the sentence.) In contrast, the passive voice focuses on the object that is acted upon: "The temperature was measured by John." (Here, the temperature, not John, is the grammatical subject of the sentence.)

To choose between active and passive voice, consider above all what you are discussing (your topic) and place it in the subject position. For example, should you write "The preprocessor sorts the two arrays" or "The two arrays are sorted by the preprocessor"? If you are discussing the preprocessor, the first sentence is the better option. In contrast, if you are discussing the arrays, the second sentence is better. If you are unsure what you are discussing, consider the surrounding sentences: Are they about the preprocessor or the two arrays?

The desire to be objective in scientific writing has led to an overuse of the passive voice, often accompanied by the exclusion of agents: "The temperature was measured " (with the verb at the end of the sentence). Admittedly, the agent is often irrelevant: No matter who measured the temperature, we would expect its value to be the same. However, a systematic preference for the passive voice is by no means optimal, for at least two reasons.

For one, sentences written in the passive voice are often less interesting or more difficult to read than those written in the active voice. A verb in the active voice does not require a person as the agent; an inanimate object is often appropriate. For example, the rather uninteresting sentence "The temperature was measured . . . " may be replaced by the more interesting "The measured temperature of 253°C suggests a secondary reaction in . . . ." In the second sentence, the subject is still temperature (so the focus remains the same), but the verb suggests is in the active voice. Similarly, the hard-to-read sentence "In this section, a discussion of the influence of the recirculating-water temperature on the conversion rate of . . . is presented " (long subject, verb at the end) can be turned into "This section discusses the influence of . . . . " The subject is now section , which is what this sentence is really about, yet the focus on the discussion has been maintained through the active-voice verb discusses .

As a second argument against a systematic preference for the passive voice, readers sometimes need people to be mentioned. A sentence such as "The temperature is believed to be the cause for . . . " is ambiguous. Readers will want to know who believes this — the authors of the paper, or the scientific community as a whole? To clarify the sentence, use the active voice and set the appropriate people as the subject, in either the third or the first person, as in the examples below.

Biologists believe the temperature to be . . . Keustermans et al. (1997) believe the temperature to be . . . The authors believe the temperature to be . . . We believe the temperature to be . . .

Avoiding dangling verb forms

A verb form needs a subject, either expressed or implied. When the verb is in a non-finite form, such as an infinitive ( to do ) or a participle ( doing ), its subject is implied to be the subject of the clause, or sometimes the closest noun phrase. In such cases, construct your sentences carefully to avoid suggesting nonsense. Consider the following two examples.

To dissect its brain, the affected fly was mounted on a . . . After aging for 72 hours at 50°C, we observed a shift in . . .

Here, the first sentence implies that the affected fly dissected its own brain, and the second implies that the authors of the paper needed to age for 72 hours at 50°C in order to observe the shift. To restore the intended meaning while keeping the infinitive to dissect or the participle aging , change the subject of each sentence as appropriate:

To dissect its brain, we mounted the affected fly on a . . . After aging for 72 hours at 50°C, the samples exhibited a shift in . . .

Alternatively, you can change or remove the infinitive or participle to restore the intended meaning:

To have its brain dissected , the affected fly was mounted on a . . . After the samples aged for 72 hours at 50°C, we observed a shift in . . .

In communication, every detail counts. Although your focus should be on conveying your message through an appropriate structure at all levels, you should also save some time to attend to the more mechanical aspects of writing in English, such as using abbreviations, writing numbers, capitalizing words, using hyphens when needed, and punctuating your text correctly.

Using abbreviations

Beware of overusing abbreviations, especially acronyms — such as GNP for gold nanoparticles . Abbreviations help keep a text concise, but they can also render it cryptic. Many acronyms also have several possible extensions ( GNP also stands for gross national product ).

Write acronyms (and only acronyms) in all uppercase ( GNP , not gnp ).

Introduce acronyms systematically the first time they are used in a document. First write the full expression, then provide the acronym in parentheses. In the full expression, and unless the journal to which you submit your paper uses a different convention, capitalize the letters that form the acronym: "we prepared Gold NanoParticles (GNP) by . . . " These capitals help readers quickly recognize what the acronym designates.

• Do not use capitals in the full expression when you are not introducing an acronym: "we prepared gold nanoparticles by… "
• As a more general rule, use first what readers know or can understand best, then put in parentheses what may be new to them. If the acronym is better known than the full expression, as may be the case for techniques such as SEM or projects such as FALCON, consider placing the acronym first: "The FALCON (Fission-Activated Laser Concept) program at…"
• In the rare case that an acronym is commonly known, you might not need to introduce it. One example is DNA in the life sciences. When in doubt, however, introduce the acronym.

In papers, consider the abstract as a stand-alone document. Therefore, if you use an acronym in both the abstract and the corresponding full paper, introduce that acronym twice: the first time you use it in the abstract and the first time you use it in the full paper. However, if you find that you use an acronym only once or twice after introducing it in your abstract, the benefit of it is limited — consider avoiding the acronym and using the full expression each time (unless you think some readers know the acronym better than the full expression).

Writing numbers

In general, write single-digit numbers (zero to nine) in words, as in three hours , and multidigit numbers (10 and above) in numerals, as in 24 hours . This rule has many exceptions, but most of them are reasonably intuitive, as shown hereafter.

Use numerals for numbers from zero to nine

• when using them with abbreviated units ( 3 mV );
• in dates and times ( 3 October , 3 pm );
• to identify figures and other items ( Figure 3 );
• for consistency when these numbers are mixed with larger numbers ( series of 3, 7, and 24 experiments ).

Use words for numbers above 10 if these numbers come at the beginning of a sentence or heading ("Two thousand eight was a challenging year for . . . "). As an alternative, rephrase the sentence to avoid this issue altogether ("The year 2008 was challenging for . . . " ) .

Capitalizing words

Capitals are often overused. In English, use initial capitals

• at beginnings: the start of a sentence, of a heading, etc.;
• for proper nouns, including nouns describing groups (compare physics and the Physics Department );
• for items identified by their number (compare in the next figure and in Figure 2 ), unless the journal to which you submit your paper uses a different convention;
• for specific words: names of days ( Monday ) and months ( April ), adjectives of nationality ( Algerian ), etc.

In contrast, do not use initial capitals for common nouns: Resist the temptation to glorify a concept, technique, or compound with capitals. For example, write finite-element method (not Finite-Element Method ), mass spectrometry (not Mass Spectrometry ), carbon dioxide (not Carbon Dioxide ), and so on, unless you are introducing an acronym (see Mechanics: Using abbreviations ).

Using hyphens

Punctuating text.

Punctuation has many rules in English; here are three that are often a challenge for non-native speakers.

As a rule, insert a comma between the subject of the main clause and whatever comes in front of it, no matter how short, as in "Surprisingly, the temperature did not increase." This comma is not always required, but it often helps and never hurts the meaning of a sentence, so it is good practice.

In series of three or more items, separate items with commas ( red, white, and blue ; yesterday, today, or tomorrow ). Do not use a comma for a series of two items ( black and white ).

In displayed lists, use the same punctuation as you would in normal text (but consider dropping the and ).

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Verb Tenses

What this handout is about.

The present simple, past simple, and present perfect verb tenses account for approximately 80% of verb tense use in academic writing. This handout will help you understand how to use these three verb tenses in your own academic writing.

Click here for a color-coded illustration of changing verb tenses in academic writing.

Present simple tense

The present simple tense is used:

In your introduction, the present simple tense describes what we already know about the topic. In the conclusion, it says what we now know about the topic and what further research is still needed.

“The data suggest…” “The research shows…”

“The dinoflagellate’s TFVCs require an unidentified substance in fresh fish excreta” (Penrose and Katz, 330).

“There is evidence that…”

“So I’m walking through the park yesterday, and I hear all of this loud music and yelling. Turns out, there’s a free concert!” “Shakespeare captures human nature so accurately.”

Past simple tense

Past simple tense is used for two main functions in most academic fields.

“…customers obviously want to be treated at least as well on fishing vessels as they are by other recreation businesses. [General claim using simple present] De Young (1987) found the quality of service to be more important than catching fish in attracting repeat customers. [Specific claim from a previous study using simple past] (Marine Science)

We conducted a secondary data analysis… (Public Health) Descriptional statistical tests and t-student test were used for statistical analysis. (Medicine) The control group of students took the course previously… (Education)

Present perfect tense

The present perfect acts as a “bridge” tense by connecting some past event or state to the present moment. It implies that whatever is being referred to in the past is still true and relevant today.

“There have been several investigations into…” “Educators have always been interested in student learning.”

Some studies have shown that girls have significantly higher fears than boys after trauma (Pfefferbaum et al., 1999; Pine &; Cohen, 2002; Shaw, 2003). Other studies have found no gender differences (Rahav and Ronen, 1994). (Psychology)

Special notes

Can i change tenses.

Yes. English is a language that uses many verb tenses at the same time. The key is choosing the verb tense that is appropriate for what you’re trying to convey.

What’s the difference between present simple and past simple for reporting research results?

• Past simple limits your claims to the results of your own study. E.g., “Our study found that teenagers were moody.” (In this study, teenagers were moody.)
• Present simple elevates your claim to a generalization. E.g., “Our study found that teenagers are moody.” (Teenagers are always moody.)

Works consulted

We consulted these works while writing this handout. This is not a comprehensive list of resources on the handout’s topic, and we encourage you to do your own research to find additional publications. Please do not use this list as a model for the format of your own reference list, as it may not match the citation style you are using. For guidance on formatting citations, please see the UNC Libraries citation tutorial . We revise these tips periodically and welcome feedback.

Biber, Douglas. 1999. Longman Grammar of Spoken and Written English . New York: Longman.

Hawes, Thomas, and Sarah Thomas. 1997. “Tense Choices in Citations.” Research into the Teaching of English 31 (3): 393-414.

Hinkel, Eli. 2004. Teaching Academic ESL Writing: Practical Techniques in Vocabulary and Grammar . Mahwah, NJ: Lawrence Erlbaum Associates.

Penrose, Ann, and Steven Katz. 2004. Writing in the Sciences: Exploring the Conventions of Scientific Discourse , 2nd ed. New York: Longman.

Swales, John, and Christine B. Feak. 2004. Academic Writing for Graduate Students: Essential Tasks and Skills , 2nd ed. Ann Arbor: University of Michigan Press.

You may reproduce it for non-commercial use if you use the entire handout and attribute the source: The Writing Center, University of North Carolina at Chapel Hill

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Dissertations & projects: Tenses

• Research questions
• The process of reviewing
• Project management
• Literature-based projects

On this page:

“You will use a range of tenses depending on what you are writing about . ” Elizabeth M Fisher, Richard C Thompson, and Daniel Holtom,   Enjoy Writing Your Science Thesis Or Dissertation!

Tenses can be tricky to master. Even well respected journals differ in the guidance they give their authors for their use. However, their are some general conventions about what tenses are used in different parts of the report/dissertation. This page gives some advice on standard practice.

What tenses will you use?

There are exceptions however, most notably in the literature review where you will use a mixture of past , present and present perfect tenses (don't worry, that is explained below), when discussing the implications of your findings when the present tense is appropriate and in the recommendations where you are likely to use the future tense.

The tenses used as standard practice in each of these sections of your report are given and explained below.

In your abstract

You have some leeway with tense use in your abstract and guidance does vary which can sometimes be confusing. We recommend the following:

Describing the current situation and reason for your study

Mostly use the present tense,  i.e. "This is the current state of affairs and this is why this study is needed."

Occasionally, you may find the need to use something called the present perfect tense when you are describing things that happened in the past but are still relevant. The present perfect tense uses have/has and then the past participle of the verb i.e. Previous research on this topic has focused on... 

Describing the aims of your study

Here you have a choice. It is perfectly acceptable to use either the present or past tense,  i.e. "This study aims to..." or "This study aimed to..." 

Describing your methodology

Use the past tense to describe what you did, i.e. "A qualitative approach was used." "A survey was undertaken to ...". "The blood sample was analysed by..."

Describing your findings

Use the past tense to describe what you found as it is specific to your study, i.e. "The results showed that...", "The analysis indicated that..."

Suggesting the implications of your study

Use the present tense as even though your study took place in the past, your implications remain relevant in the present, i.e. Results revealed x which indicates that..."

Example abstract 

An example abstract with reasoning for the tenses chosen can be found at the bottom of this excellent blog post: 

Using the Present Tense and Past Tense When Writing an Abstract

In your methodology

The methodology is one of the easiest sections when it comes to tenses as you are explaining to your reader what you did. This is therefore almost exclusively written in the past tense.

Blood specimens were frozen at -80 o C.

A survey was designed using the Jisc Surveys tool.

Participants were purposefully selected.

The following search strategy was used to search the literature:

Very occasionally you may use the present tense if you are justifying a decision you have taken (as the justification is still valid, not just at the time you made the decision). For example: 

Purposeful sampling was used to ensure that a range of views were included. This sampling method maximises efficiency and validity as it identifies information-rich cases and ... (Morse & Niehaus, 2009).

In your discussion/conclusion

This will primarily be written in the present tense as you are generally discussing or making conclusions about the relevance of your findings at the present time. So you may write:

The findings of this research suggest that.../are potentially important because.../could open a new avenue for further research...

There will also be times when you use the past tense , especially when referring to part of your own research or previous published research research - but this is usually followed by something in the present tense to indicate the current relevance or the future tense to indicate possible future directions:

Analysis of the survey results found most respondents were not concerned with the processes, just the outcome. This suggests that managers should focus on...

These findings mirrored those of Cheung (2020), who also found that ESL pupils failed to understand some basic yet fundamental instructions. Addressing this will help ensure...

In your introduction

The introduction generally introduces what is in the rest of your document as is therefore describing the present situation and so uses the present tense :

Chapter 3  describes  the research methodology.

Depending on your discipline, your introduction may also review the literature so please also see that section below.

In your literature review

The findings of some literature may only be applicable in the specific circumstances that the research was undertaken and so need grounding to that study. Conversely, the findings of other literature may now be accepted as established knowledge. Also, you may consider the findings of older literature to be still relevant and relatively recent literature be already superseded. The tenses you write in will help to indicate a lot of this to the reader. In other words, you will use a mix of tenses in your review depending on what you are implying.

Findings only applicable in the specific circumstances

Use the past tense . For example: 

In an early study, Sharkey et al. (1991)  found  that isoprene emissions  were doubled  in leaves on sunnier sides of oak and aspen trees. 

Using the past tense indicates that you are not implying that isoprene emissions are always doubled on the sunnier side of the trees, just that is what was found in the Sharkey et al. study.

Findings that are still relevant or now established knowledge

Mostly use the present tense , unless the study is not recent and the authors are the subject of the sentence (which you should use very sparingly in a literature review) when you may need to use a mixture of the past and present. For example:

A narrowing of what 'graduateness' represents damages students’ abilities to thrive as they move through what will almost certainly be complex career pathways (Holmes, 2001).

Holmes (2001) argued strongly that a narrowing of what 'graduateness' represents damages  students’ abilities to thrive as they move through what will almost certainly be complex career pathways

Both of these imply that you think this is still the case (although it is perhaps more strongly implied in the first example). You may also want to use some academic caution too - such as writing 'may damage' rather than the more definite 'damages'.

Presenting your results

As with your methodology, your results section should be written in the past tense . This indicates that you are accepting that the results are specific to your research. Whilst they may have current implications, that part will not be considered until your discussion/conclusions section(s).

Four main themes were identified from the interview data.

There was a significant change in oxygen levels.

Like with the methodology, you will occasionally switch to present tense to write things like "Table 3.4 shows that ..." but generally, stick to the past tense.

In your recommendations

Not everyone will need to include recommendations and some may have them as part of the conclusions chapter. Recommendations are written in a mixture of the present tense and  future tense :

It is recommended that ward layout is adapted, where possible, to provide low-sensory bays for patients with autism. These will still be useable by all patients but...

Useful links

• Verb tenses in scientific manuscripts From International Science Editing
• Which Verb Tenses Should I Use in a Research Paper? Blog from WordVice
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How to Use Tenses within Scientific Writing

Written by: Chloe Collier

One’s tense will vary depending on what one is trying to convey within their paper or section of their paper. For example, the tense may change between the methods section and the discussion section.

Abstract --> Past tense

• The abstract is usually in the past tense due to it showing what has already been studied.

Example: “This study was conducted at the Iyarina Field School, and within the indigenous Waorani community within Yasuni National Park region.”

Introduction --> Present tense

• Example: “ Clidemia heterophylla and Piperaceae musteum are both plants with ant domata, meaning that there is an ant mutualism which protects them from a higher level of herbivory.”

Methods --> Past tense

• In the methods section one would use past tense due to what they have done was in the past.
• It has been debated whether one should use active or passive voice. The scientific journal Nature states that one should use active voice as to convey the concepts more directly.
• Example: “In the geographic areas selected for the study, ten random focal plants were selected as points for the study.”

Results --> Past tense

• Example: “We observed that there was no significant statistical difference in herbivory on Piperaceae between the two locations, Yasuni National Park, Ecuador (01° 10’ 11, 13”S and 77° 10’ 01. 47 NW) and Iyarina Field School, Ecuador (01° 02’ 35.2” S and 77° 43’ 02. 45” W), with the one exception being that there was found to be a statistical significance in the number count within a one-meter radius of Piperaceae musteum (Piperaceae).”

Discussion --> Present tense and past tense

• Example: “Symbiotic ant mutualistic relationships within species will defend their host plant since the plant provides them with food. In the case of Melastomataceae, they have swellings at the base of their petioles that house the ants and aid to protect them from herbivores.”
• One would use past tense to summarize one’s results
• Example: “In the future to further this experiment, we would expand this project and expand our sample size in order to have a more solid base for our findings.”

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Tense tendencies in academic texts

Published on September 30, 2014 by Shane Bryson . Revised on July 23, 2023.

Different sections of academic papers ( theses , dissertations and essays ) tend to use different tenses .  The following is a breakdown of these tendencies by section.  Please note that while it is useful to keep these tendencies in mind, there may be exceptions.  The breakdown below should help guide your writing, but keep in mind that you may have to shift tenses in any given section, depending on your topic matter.

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Table of contents

Abstract or summary, introduction, theoretical framework, literature review, methods and results, conclusions or discussion, limitations, recommendations and implications, other interesting articles, present simple: for facts and general truisms; to say what the paper does.

This thesis examines the ways that ecological poetry relates to political activism.

Our research suggests better economic policies.

Present perfect: for past events or research still relevant to the present

Thinkers have examined how ecological poetry relates to political activism.

Other economists have suggested different economic policies.

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Present simple: to say what the paper does and why it is important.

This research is relevant to how we understand the role of poetry.

Effective economic policies help societies to prosper.

Past simple: to provide historical background

In his time, Thoreau concerned himself with living in harmony with nature.

Ronald Reagan’s policies changed America’s political landscape.  

Present simple: to describe theories and provide definitions

In lyric poetry, the speaker presents his perspective on a given situation.

“Reaganomics” refers to the economic policies of Reagan administration.

Present perfect: for past research still relevant to the paper’s current research

Past simple: to describe specific steps or actions of past researchers, past simple: for events that began and ended in the past, such as an experiment.

We conducted semi-structured interviews with the participants.

We found that participants had much to say about their workplaces.

A multivariate linear regression was used.

Present simple: to describe a tool’s function (which does not change over time)

Multivariate linear regressions are  relevant to use for sets of correlated random variables.

Present simple: for interpretations of data

The results indicate a steady increase in net gain for x and y companies.

We cannot conclude that this growth will continue on the basis of this study.

Past simple: for details about how the study happened

The sample size was adequate for a qualitative analysis, but it was not big enough to provide good grounds for predictions.

Modal auxiliary to indicate lack of a certain outcome or simple future with hedging word: for thoughts on what future studies might focus on, and for careful predictions

Modal auxiliary : Responses to the survey suggest that many more people in this profession may be unsatisfied with their vacation time.

Modal auxiliary : Future research should conduct more sustained investigations of this phenomenon.

Simple future with hedging word : The results of the study indicate that the glaciers will likely continue to melt.

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Capstone Form and Style

Grammar and mechanics: verb tenses, most common verb tenses in academic writing.

According to corpus research, in academic writing, the three tenses used the most often are the simple present , the simple past , and the present perfect (Biber et al., 1999; Caplan, 2012). The next most common tense for capstone writers is the future ; the doctoral study/dissertation proposal at Walden is written in this tense for a study that will be conducted in the future. The blog post on What Verb Tenses Do You Need to Master for Academic Writing addresses these ideas as well.

Biber, D., Johansson, S., Leech, G., Conrad, S., & Finegan, E. (1999). Longman grammar of written and spoken English . Pearson. https://doi.org/10.1162/089120101300346831

Caplan, N. A. (2012). Grammar choices for graduate and professional writers . University of Michigan Press.

Simple present: Use the simple present to describe a general truth or a habitual action. This tense indicates that the statement is generally true in the past, present, and future.

• Example: Research methods include qualitative, quantitative, and mixed methods.

Simple past : Use the simple past tense to describe a completed action that took place at a specific point in the past (e.g., last year, 1 hour ago, last Sunday). In this example, the specific point of time in the past is 1998.

• Example: Zimbardo (1998) researched many aspects of social psychology.

Present perfect: Use the present perfect to indicate an action that occurred at a nonspecific time in the past. This action has relevance in the present. The present perfect is also sometimes used to introduce background information in a paragraph. After the first sentence, the tense shifts to the simple past.

• Example: Numerous researchers have used this method.
• Example: Many researchers have studied how small business owners can be successful beyond the initial few years in business. They found common themes among small business owners.

Future: Use the future to describe an action that will take place at a particular point in the future (at Walden, this is used especially when writing a proposal for a doctoral capstone study).

• Example: I will conduct semistructured interviews.

Keep in mind that verb tenses should be adjusted after the proposal after the research has been completed. See Verb Tense Considerations: Proposal to Final Study farther down on this page and this blog post about Revising the Proposal for the Final Capstone Document for more information.

APA Style Guidelines on Verb Tense

APA calls for consistency and accuracy in verb tense usage. In other words, avoid unnecessary shifts in verb tense within a paragraph or in adjacent paragraphs to help ensure smooth expression.

• Use the past tense (e.g., researchers presented ) or the present perfect (e.g., researchers have presented ) for the literature review and the description of the procedure if discussing past events.
• Use the past tense to describe the results (e.g., test scores improved significantly ).
• Use the present tense to discuss implications of the results and present conclusions (e.g., the results of the study show …).

Refer to the work of another researcher in the past.

• Patterson (2017) presented, found, stated, discovered…

However, there can be a shift to the present tense if the research findings still hold true:

• King (2016) found that revising a document three times improves the final grade.
• Smith (2018) discovered that the treatment is effective.

Verb Tense Guidelines When Referring to the Document Itself

To preview what is coming in the document or to explain what is happening at that moment in the document, use the present or future tense:

• In this study, I will describe …
• In this study, I describe …
• In the next chapter, I will discuss …
• In the next chapter, I discuss …

To refer back to information already covered, such as summaries of discussions that have already taken place or conclusions to chapters/sections, use the past tense:

• Chapter 1 included my original discussion of the research questions.
• In summary, in this section, I presented information on…

Simple Past Versus the Present Perfect

Rules for the use of the present perfect differ slightly in British and American English. Researchers have also found that among American English writers, sometimes individual preferences dictate whether the simple past or the present perfect is used. In other words, one American English writer may choose the simple past in a place where another American English writer may choose the present perfect.

Keep in mind, however, that the simple past is used for a completed action. It often is used with signal words such as yesterday, last week, 1 year ago, or in 2015 to indicate the specific time in the past when the action took place.

• I collected data in 2017 .
• All prospective participants signed an informed consent form in a 1-week period before data collection began.

The present perfect focuses more on an action that occurred without focusing on the specific time it happened. Note that the specific time is not given, just that the action has occurred.

• I have examined several possible research designs.

The present perfect focuses more on the result of the action.

• The panel of experts has completed the instrument validation.

The present perfect is often used with signal words such as since, already, just, until now, (not) yet, so far, ever, lately , or recently .

• I have already examined several possible research designs.
• The panel of experts has recently completed the instrument validation.
• Researchers have used this method since it was developed.

Also see the blog post on Choosing the Present Perfect Tense in Academic Writing for more information and examples.

Verb Tense Considerations: Proposal to Final Study

Unlike the proposal , where the writer describes a study not yet conducted, the final study is a report of what actually happened in the research or project study process, so the writer must revise the relevant portions of the proposal accordingly when incorporating them into the final capstone document. One essential step is to determine which verbs require a change in tense for logical and accurate reporting of the completed study. Although many sentences will shift from future to past tense, this shift is not appropriate in all cases. These guidelines address specific considerations for deciding where a shift in tense is necessary during this revision process.   

Future tense verbs that need to shift to past tense in the final study include those representing actions, decisions, or processes that happened after approval of the proposal, such as in the following examples:

Proposal: In this study, I will employ face-to-face interviews with key participants, reflexive notes, and a review of literature… Final study: In this study, I employed face-to-face interviews with key participants, reflexive notes, and a review of literature…

Proposal: The sample will consist of 10 to 20 graduate students who have completed at least three graduate courses in the past year. Final study: The sample consisted of 12 graduate students who had completed * at least three graduate courses in the past year. * Note the related verb tense shift from present perfect to past perfect in the second example.

Not all verbs require a shift in tense. Here are a few such cases:

• In this chapter, I describe … (or will describe … )
• NOT: In this chapter, I described …
• This study’s findings could lead to positive social change by… 
• The results of this study may serve to increase awareness of…
• Researchers have argued that the continued loss of experienced nurses will have negative effects on...
• As technology advances, future researchers will want to focus on…
• This professional development project will address the problem of…
• This systematic review will provide support for evidence-based best practices for…

Strategy for revising verb tense from proposal to final study:

• Use Ctrl+F (or Command+F on a Mac) or click the Find button under the Home tab to search for occurrences of the word will in the document.
• On a case-by-case basis, examine each statement containing will to determine whether revision is needed. Avoid using Replace All in the Find and Replace menu because, as noted above, not all uses of future tense refer to the proposal itself.
• Check the context in which the word will occurs to see if other revisions are warranted nearby.

Keep in mind that, although this strategy can make finding and revising proposal-specific language a bit easier, there is no substitute for careful, systematic proofreading of the document.

Final note and related resources:

Inadequate revision of verb tense and other proposal-specific language is among the Top 10 Reasons for Delays at the F&S Review , so taking the time for this process well before that stage is important.

Capstone writers should consult the Form and Style Checklist for this and other important aspects of revising the final study or project in preparation for the Form and Style Review .

Summary of English Verb Tenses

The 12 main tenses:

• Simple present : She writes every day.
• Present progressive: She is writing right now.
• Simple past : She wrote last night.
• Past progressive: She was writing when he called.
• Simple future : She will write tomorrow.
• Future progressive: She will be writing when you arrive.
• Present perfect : She has written Chapter 1.
• Present perfect progressive: She has been writing for 2 hours.
• Past perfect: She had written Chapter 3 before she started Chapter 4.
• Past perfect progressive: She had been writing for 2 hours before her friends arrived.
• Future perfect: She will have written Chapter 4 before she writes Chapter 5.
• Future perfect progressive: She will have been writing for 2 hours by the time her friends come over.

Conditionals:

Zero conditional (general truths/general habits).

• Example: If I have time, I write every day.

First conditional (possible or likely things in the future).

• Example: If I have time, I will write every day.

Second conditional (impossible things in the present/unlikely in the future).

• Example : If I had time, I would write every day.

Third conditional (things that did not happen in the past and their imaginary results)

• Example : If I had had time, I would have written every day.

Subjunctive : This form is sometimes used in that -clauses that are the object of certain verbs or follow certain adjectives. The form of the subjective is the simple form of the verb. It is the same for all persons and number.

• Example : I recommend that future researchers include other populations in their studies.
• Example: It is important that staff at the study site establish criteria for implementing study findings.
• Previous Page: Relative, Restrictive, and Nonrestrictive Clauses
• Next Page: Subject–Verb Agreement
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Verb Tenses to Use in a Research Paper

Why Using the Correct Verb Tense is Important

When writing an academic paper, writers should follow the accepted grammar and style conventions: not only to abide by the institutional and domain standards, but to communicate clearly to readers what was studied, when it took place, and from what perspective you are discussing your research (and that of others) in your paper. One crucial writing element that you must consider when composing your paper is  verb tense . Which tense you use will determine the flow and coherency of your paper.

You might have found yourself thinking along these lines: “Everything in this study has already been completed, so shouldn’t I simply write everything in the simple past tense?”

The answer is no–at least not in a strict sense. The verb tense you use for a given sentence or phrase depends on your position as the author to the material you are discussing. As the author, you look at each element mentioned in your text from a distance in terms of your role: as a participant, critic, or messenger, among others. You must also take into account the chronological reasons for choosing between present and past tenses in a given instance.

Knowing which tense to use requires both knowledge of the exact guidelines set out for you in whichever formatting style you are following ( APA , AMA , etc.), as well as some discretion and savvy in choosing the tense that makes the most sense for a given statement in the paper.

While new authors should certainly familiarize themselves with the specific guidelines of the formatting style they are applying, this article will focus on the  most common rules of verb tense applied to research papers in journals and at academic institutions, reflecting basic verb usage rules in academic English and encompassing  all  formatting styles.

Bear in mind that these grammar and verb-tense issues will largely be corrected by any competent proofreading service or research paper editing service , and thus professional revision of all academic documents is recommended before submission to journals or conferences.

Rules for Present, Past, and Perfect Tense Verbs

First, there are three basic verb tenses used in research papers:  present  (simple present),  simple   past , and  present perfect . We will talk about how research paper sections determine verb tense in a minute, but first, let’s review when each tense should be used in general throughout the paper.

PRESENT TENSE VERBS

The present tense is used to talk about general facts, discuss current meanings and implications, and suggest future applications .

General facts are constant and do not change throughout time (the ultimate evolution of scientific progress notwithstanding). Always use the present when discussing general scientific facts.

Example: “Insulin and glucagon regulates blood glucose levels.” 

Implications are closely related to general facts and thus the same rule is applied.

Example: “An elevated glucose level indicates a lack of glucagon hormones in the pancreas.”

Further research is called for or stressed as important through a phrase in the present tense.

Example: “Further studies about glucagon receptors are needed.”

SIMPLE PAST TENSE VERBS

The simple past is generally used to discuss events that have been c ompleted in the past at some distinct time and/or place . It is most often applied to discrete events such as studies, experiments, or observed phenomena.

Example: “Scientists in Wales discovered a new enzyme in the liver.” Example: “Protocol X was used to analyze the data.”

PRESENT PERFECT TENSE VERBS

The present perfect tense (or simply “perfect tense”) is used in research papers to refer to  events or actions that have taken place at some unidentified time in the past or have started but are still ongoing or only recently completed . It often establishes a general background in the Introduction section , adding a backdrop on which you can explain the motivations for and purpose of your study.

Note that it is the least frequently used tense in most research papers and should not be over-employed–focus more on detailed actions by using the simple past.

Example:  “Many studies have focused on glucagon as an important regulating hormone.” Example:  “Until recently, researchers have analyzed this kind of data using Chi-Square Statistics.” Example:  “Efforts have been made to understand more about this process.”  (passive)

Appropriate Verb Tenses by Research Paper Section

It bears repeating that the “best” tense to use is the one that is recommended (or demanded) by whichever formatting manual you are using. However, there is a high degree of continuity between the common styles, and the following rules for usage in each section will likely apply to your research paper no matter where it will be published.

Abstract verb tenses

In general, use the simple past for the abstract of your manuscript; for a concise introductory sentence, use the present perfect. To establish a need for your study—–for instance, by explaining the current circumstances of the world or the specific area in which you are working—–you can also use the present tense.

Example of introductory sentence (present perfect): “Recent studies of glucagon and insulin production have led to breakthroughs in medicine.” Example of establishing background/circumstances/purpose (present): “Diabetes  accounts for a higher number of deaths in the US than previously calculated.”

For general statements and facts, the paper itself, or analysis of findings, use the present tense.

Example of a statement of fact: “In the US, diabetes is the most common endocrine disease.”

If you are stating a fact or finding from an earlier specified time or place, use the simple past:

Example: “In 2016, diabetes was the most common endocrine disease.” Have a look at our more in-depth instruction to writing an abstract for a research paper or at these do’s and don’ts of abstract writing if you need additional input.

Introduction section verb tenses

Use a mixture of present and past tense in the introduction section .

The present tense is applied when discussing something that is always true; the simple past tense is used for earlier research efforts, either your own or those reported by another group.

Example of earlier research efforts (simple past): “This same research team discovered a similar enzyme in their 2012 study.”

If the time or location of the demonstration is unknown or not important, use the present perfect.

Example: “Prior research has indicated a correlation between X and Y.”

For the concluding statements of your introduction, use the simple past or present perfect.

Example of concluding statement (simple past): “The CalTech glucagon studies were inconclusive.” Example of concluding statement (present perfect): “Prior research in this area has been inconclusive.”

Use the past perfect when you talk about something that happened or was found to be the case in the past, but which has since been revised. Example of revised information (past perfect): “The Dublonsky study had determined that X was Y, but a 2012 study found this to be incorrect.”

Literature review verb tenses

Knowing which tenses to use for a literature review (either as part of a research paper or as a stand-alone article) can be a bit tricky, as your usage depends both on which style manual you are using (APA, AMA, MLA , or others) and on how you are discussing the literature.

The simple past is usually applied when using the researcher’s name as the subject of the sentence and discussing the methods or results of that study itself

Example of describing researcher’s actions: “Pearson (1997) discovered a new enzyme using similar methods.”

Other verbs commonly found in this usage context: investigated, compared, studied, analyzed, investigated, found, confirmed, performed, etc.

When giving your opinion on another researcher’s work or bringing up the results, discussion, and conclusions they make in their work, use the present tense.

Example of discussing another’s work: “Ryuku (2005) concludes that there are no additional enzymes present in the liver, a finding this current study directly refutes.” Other verbs commonly found in this usage context: stresses, advocates, remarks, argues, claims, posits. etc.

Methods section verb tenses

The Methods section fairly clearly delineates between sections written in past and those written in present tense.

Use the simple past tense to talk about what you did. (Note that you will generally find the passive voice used when describing the actions of the researchers. This puts more focus on the actions being completed and less on the agents completing the action. Passive voice has become the general standard for research papers in recent decades, but it is okay to mix passive and active voice in order to make your paper clearer and more readable.)

Example of methods of study: “A glucose molecule was added to the mixture to see how the peptide would respond.” Example of methods of analysis: “The results were analyzed using Bayesian inference.”

Use the present tense to refer to or explain diagrams, figures, tables, and charts.

Example: “Table 5 shows the results of this first isolated test.” Example: “The results of this first isolated test are displayed in Table 5.”

Results section verb tenses

The verb tense rules for the Results section are quite similar to those applied to the Methods section.

Use the past tense to discuss actual results.

Example: “The addition of 0.02 μg of glycogen activated receptor cells.” Example: “Receptor cells were activated by the addition of 0.02 μg of glycogen.”

Use the simple present tense to explain diagrams/figures/tables. Again, sentences may use both the active and passive voice.

Discussion section verb tenses

The Discussion section consists of an analysis of the findings and a kind of translation of the meanings and implications of these findings.

Use the simple past to summarize your own findings.

Example of summarizing own findings: “The experiment yielded a number of results associated with the processing of glucose.”

Use the present tense to interpret and discuss the significance of your findings.

Example: “[This study confirms that] synthetic glucagon is two-thirds as effective at decreasing fatty acid synthesis.”

Conclusions and further work

The conclusion and call for further work to be done are either provided in the last sentence or two of your paper or in a separate (but short) section at the end of the main text (check the target journal’s author instructions to be sure you follow the journal style) and summarize or emphasize the new insights your work offers.

Use the present perfect tense to clarify that your statements still hold true at the time of reading.

Example: “Results from this study have led to a deeper understanding about how different peptides interact in this enzyme.”

Use the present tense to apply findings, state implications, and suggest further research.

Example of wider implications: “This study confirms that endogenous glucagon is even more essential in metabolism than previously thought.”

When discussing further research that is either needed or intended to be carried out, the future or present tense (or subjunctive mood) can also be used, in addition to the present tense passive voice.

Example of call for future research: “Further clinical studies are needed/will be needed/must be carried out/should be carried out to isolate the cause of this reaction.”

Follow these general rules about tenses and your paper will be clearer, more chronologically correct, and generally easier to read—meaning the important implications of your study will be more easily understood. You can always go back and edit verb tenses—the more you practice, and the more papers you read, the easier it will be to identify which tense should be used for which kind of information.

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• v.37(29); 2022 Jul 25

Using Guidelines to Improve Scientific Writing: Tips on Use of Correct Verb Tenses for Non-Native English-Speaking Researchers

Takako kojima.

Center for International Education and Research, Tokyo Medical University, Tokyo, Japan.

Helena A. Popiel

Writing a medical English paper is an arduous and time-consuming task, especially for non-native English-speaking researchers. No matter how good the research may be, it is difficult for manuscripts to become accepted unless the criteria of a ‘readable’ manuscript are met and reviewers can clearly understand the content and importance of the research.

Following the guidelines of the journal to which a researcher will submit his/her paper, is the norm in clinical research, but it is important to know that there are also so-called ‘international standards’ not just for conducting research, but for preparing medical manuscripts. These ‘standards’ refer to the grammar style, which includes verb tenses, and the writing style, such as the use of appropriate words and phrases. Familiarizing oneself with such guidelines and standards will help non-native English-speaking researchers in preparing manuscripts.

The purpose of this paper focuses is to provide basic information on manuals and guidelines that are regarded as ‘international standards’ for medical writing, and how these can be used to assist researchers on the correct use of tenses; and to introduce common mistakes made by non-native English-speaking researchers related to the use of verb tenses through our experience as medical editors in Japan.

What Is a Readable Manuscript?

A ‘readable’ manuscript is one that is written in a manner that is clear to understand, accurate, and concise, to all readers. Manuscripts need to be understood effortlessly by editors and reviewers, in addition to the general readership who may have no expert knowledge about the topic. This means that authors will need to pay attention to 1) correct grammar (which includes verb tenses), punctuation, and spelling, 2) correct word use and appropriate expressions, 3) correct sentence structure, and 4) correct editorial style, meaning conforming to the editorial style of the journal to which it is submitted. Only when all 4 of these factors are in place, will the paper give the impression of a well-written or ‘readable’ paper. The scientific content is of utmost importance, but the style in which the research is presented is also significant and must also be taken into consideration. If a manuscript is poorly written, such as with numerous grammatical mistakes, it can give a bad impression, which may affect the overall evaluation of the manuscript, even if the science may be of high quality.

How Guidelines and Manuals Can Assist Researchers

For non-native English-speaking researchers, however, creating such ‘readable’ manuscripts is obviously difficult due to insufficient level of English proficiency and differences in linguistic styles among languages. 1

Journal guidelines and style manuals can provide authors with fundamental knowledge on various topics, so that authors have a basic idea of what journals are looking for. Although many guidelines and manuals are available, familiarizing oneself with the main ones that have been created by leading associations and organizations will enable authors to understand the global standard in medical writing, and to prepare manuscripts targeting global readership. 2 Guidelines, such as the AMA Manual of Style 3 published by the American Medical Association, the Publication Manual of the American Psychological Association, 4 and the Recommendations for the Conduct, Reporting, Editing and Publication of Scholarly Work in Medical Journals (known as the ICMJE Recommendations) created by the International Committee of Medical Journal Editors 5 provide detailed explanations on manuscript preparation. Whereas the ICMJE Recommendations give instructions on how to correctly format or create the framework for a manuscript, the AMA Manual of Style gives specific information on the correct use of words and phrases, which may be highly useful for non-native English-speaking researchers to further improve writing style. The AMA Manual of Style, with its first edition published in 1962, was originally intended for use by in-house editors for the Journal of the American Medical Association (JAMA) and its network journals. However, during the subsequent years, recognition of this manual has grown substantially among editors and publishers in scientific publishing. 6 The contents have been reviewed and revised by experts to reflect the changes associated with advances in technology, the internet, and the electronic evolution of writing, editing, and publishing, both in the US and internationally. 6 In particular, we recommend Chapter 7, entitled “Grammar”, 7 and Chapter 11, entitled “Correct and Preferred Usage of Common Words and Phrases”, 8 which many medical editors refer to as the standard when editing manuscripts.

For example, regarding verb tenses, the AMA Manual of Style states that it is important to choose the correct verb tense that expresses the time that is intended, while also emphasizing the importance of maintaining consistency of tenses in a sentence. 7

e.g., There were no adverse events reported in the control group, but there were 3 in the intervention group. 7

However, it also provides an example of when it may be necessary to use different tenses within a single sentence to place 2 things in temporal context.

e.g., Although the previous report demonstrated a significant response, the follow-up study does not. 7

Using different verb tenses in a sentence as above may be particularly difficult for non-native English-speaking researchers when writing a manuscript, as they are often taught to maintain a single verb tense in a sentence. However, different verb tenses in a sentence may be useful, or even necessary for accurately explaining a study and the results, and hence non-native English-speaking researchers are advised to refer to various guidelines to understand these rules.

Other guidelines also offer recommendations on verb tense. The European Association of Science Editors (EASE) Guidelines for Authors and Translators of Scientific Articles to be Published in English is currently freely available online in 30 different languages. 9 In the section on “Language Matters”, the guidelines state that in general, the past tense should be used when describing how the study was performed, and hence the Materials and Methods section should be in the past tense. Furthermore, they recommend the use of past tense when giving general statements and interpretations, such as statistical significance and conclusions. 9 Additionally, the American Chemical Society Style Guide says using the appropriate verb tense is essential in orienting the reader as to the nature of the information and states that the past tense should be used to present what was done, and the present tense to present statements of fact. It also states that present or past tense may be used for the results, discussion and conclusions sections but that consistency is important within the paper. 10

Correct Verb Tense Use In a Manuscript

Although information on the correct use of verb tenses for medical writing can be acquired from various manuals as well as from the internet, it is often easier to understand these verb tense rules by seeing actual mistakes that other non-native researchers have made. We will hence introduce a few examples below, from actual manuscripts that we have edited (with modifications as appropriate).

When explaining the experiments that were performed in the research, the past tense is generally used, regardless of the section of the manuscript in which the information appears (i.e., Introduction, Materials and Methods, Results, etc.). Therefore,

Incorrect: The XX software has been used to analyze the surgical techniques of novel surgeons.

Correct: The XX software was used to analyze the surgical techniques of novel surgeons.

Incorrect: Hearing classes B, C, and D are defined as having preoperative hearing loss.

Correct: Hearing classes B, C, and D were defined as having preoperative hearing loss.

Similarly, when explaining the results obtained from the research, the past tense is used regardless of the section of the manuscript. Therefore,

Incorrect: Cerebrospinal fluid analysis demonstrate that the patient was positive for XX.

Correct: Cerebrospinal fluid analysis demonstrated that the patient was positive for XX.

When referring to a specific figure or table within the manuscript, the present tense should be used. Therefore,

Incorrect: Table 1 showed the demographic characteristics of the patients.

Correct: Table 1 shows the demographic characteristics of the patients.

When introducing previous studies with results that are still considered to be true, the present perfect tense is generally used. Therefore,

Incorrect: It is suggested that XX comprising more than 80% necrotic tissue on endoscopic ultrasonography is suitable for these techniques.

Correct: It has been suggested that XX comprising more than 80% necrotic tissue on endoscopic ultrasonography is suitable for these techniques.

Conclusions of a study are generally written in the past tense. Therefore,

Incorrect: In conclusion, we report a case of a patient with XX, whose direct Coombs test was transiently positive.

Correct: In conclusion, we reported a case of a patient with XX, whose direct Coombs test was transiently positive.

These are just a few examples to provide the reader with an idea of the correct use of verb tenses in medical research manuscripts written in English. Ideally, if a non-native English speaker writing a research manuscript can have their manuscript edited by a native English-speaking editor or an editing service, it is recommended that they go through the edited manuscript to go over the corrections made in verb tenses, while referring to guidelines and manuals on the rules of verb tenses (such as the ones introduced above), to acquire a better understanding of verb tense use in medical research manuscripts.

Guidelines and the Significance of Revisions

As the international language of medical and scientific research is English, researchers are required to publish their research in English, regardless of their native language. Furthermore, regardless of the journal rank or type of journal, the common goal of journals should be to publish high-quality manuscripts, thus improving the general level of the journal. 11 Authors may be aware of the significance of adhering to guidelines for performing their research, but they may not necessarily be aware of how guidelines may help to educate themselves about what is the acceptable standard for scientific writing. For instance, up until the recently revised AMA Manual of Style 11 th edition, certain phrases and writing styles that were considered incorrect, are now acceptable. One significant example is that in the 10 th edition, it was incorrect to say, “the patient was diagnosed with lung cancer”, because only a disease could be diagnosed, and not a patient . However, the 11 th edition clearly states that this expression is now acceptable. 8 In addition, before the recent revision, authors needed to include a space between numbers and units, e.g., 2 cm, and the only exception was the percentage (%) and degrees Celsius (°C) symbols. However, authors are now required to include a space when using the % and °C symbols as well. 3

As Gasparyan et al. 11 suggest, regular revisions and issuing of guidelines for medical writing by professional associations and making teaching materials and educational meetings accessible to researchers worldwide, especially to those who are non-native English speakers, are valuable ways to support not only researchers but the entire scientific publishing community. Despite the fact that there are many manuscripts that do not adhere to guidelines but are still published, this does not mean that it is acceptable to be ignorant of such standards and rules. We, as authors, researchers, and educators must try to collaborate to overcome such differences in standards in scientific publishing, which is expected to lead to improvements in the general quality of scientific and medical literature, and to support non-native English-speaking researchers in preparing high-quality manuscripts that meet the ‘international standard.’

Disclosure: The authors have no conflicts of interest to declare.

Writing up a Research Report

• First Online: 04 January 2024

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• Stefan Hunziker 3 &
• Michael Blankenagel 3  

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A research report is one big argument about how and why you came up with your conclusions. To make it a convincing argument, a typical guiding structure has developed. In the different chapters, there are distinct issues that need to be addressed to explain to the reader why your conclusions are valid. The governing principle for writing the report is full disclosure: to explain everything and ensure replicability by another researcher.

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• Jun 24, 2021

Using Tenses In Research Articles

Updated: Jul 10, 2021

When you write an experimental report, or draft a thesis chapter, you need to choose which tense, or tenses, to use.

This flyer provides advice intended to help you become more conscious of what the choice of verb tense involves, and to become better able to notice the tense choices that writers in your particular field have made.

From your chosen tense, your reader receives two kinds of information. One concerns time: it is about ‘when’ (past, present or future). The other relates to whether an event or process is open or closed.

The examples below illustrate the distinction between ‘open’ and ‘closed’ events:

How long were you at Melbourne Uni?

Simple past / closed event: the other person has already graduated.

How long have you been at Melbourne Uni?

Present perfect / open event: the other person is still engaged on his / her course.

What do tenses do?

Verb tenses present a relationship between.

• the present moment (now), and,

• another moment or period in time (which may be long or short).

These moments or periods may be in the past, present or future.

Tenses manage time by placing them within particular relationships or ‘time frameworks’.

As a generalization: in various types of scientific writing, some time frameworks are more commonly used than others. Their frequency varies from one section of a paper or report to another, and they can also vary between one scientific discipline and another.

The next section gives some advice about the various tenses.

This usually refers to your unpublished results and uses the past tense.

Introduction

Your introduction needs to include background information which is generally accepted as fact in a discipline. You also need to explain why the research you are reporting is important. It is usually presented in the present tense. Example:

Genomics provides crucial information for rational drug design.

You will need to refer to existing research relevant to your work, and you can indicate your opinion of the research you are writing about by careful tense selection.

For example, when you use the present tense you are indicating to the reader that you believe that the research findings are still true and relevant, even though the original research may have been conducted some time ago. Example:

Many of the lakes and wetlands in the region are located in craters or valleys blocked by early Pliocene lava flows (Ollier & Joyce, 1964).

Present perfect tense to report research

If you use present perfect tense in your introduction when you refer to previous research, you communicate ‘recency’ or ‘currency’. Currency may be positive (asserting that previous studies have established a firm research foundation) or negative (asserting that not enough relevant or valid work has yet been done).

Positive and negative currency can even be asserted in the same sentence, as in the example below (which uses the passive voice): Example:

A great deal of research has been conducted on the basic techniques of nuclear transfer, but few experiments have been carried out to discover the most appropriate age of the cytoplasm to support nuclear transfer most effectively.

Past tense to describe what was done

In your methods section it is customary to use a form of the simple past tense to describe what you did in your study. Passive voice is often used. Examples:

Total phosphorous (TP) and total nitrogen (TN) were measured in the laboratory using standard procedures.

The standard protocol was followed for the preparation of the media from stock solutions.

The two previous examples are in the past tense, but in the passive voice. Have a look at the following examples in the past passive and past active voice.

Past passive

Three 2 liter samples were taken at a depth of between

0.1 and 0.5 m at the down-wind end of each wetland.

Past active

Each of the three groups took 2 liter samples at a depth of between 0.1 and 0.5m at the down-wind end of each wetland.

From your reading, which voice do you think is most often used in your scientific discipline – active, or passive?

Present tense for diagrams and figures

If you use figures or diagrams to help explain what you did, refer to the figure or diagram using the present tense. Examples:

Table 1 above demonstrates the success of cloning in various animal species.

Figure 2 below shows methylation in mouse 2-cell embryos.

Past tense for results obtained

In the results section, use the past tense to detail the results you obtained. Examples:

Overall, more than 70% of the insects collected were non-phytophagous.

Results indicated that prolonged exposure to ultra-violet radiation had a positive correlation with the development of melanomas.

Following activation of NT oocytes with strontium, the cell cycle resumed in both groups.

Present tense to refer to figures, tables and graphs

As in the previous sections, use the present tense

when you refer to figures, tables and graphs

Examples: Figure 1 displays the comparative variation in the morphology of donor chromatin in both age groups of oocytes.

Table 1 below shows the stream flows calculated for each stream using Equation 1.

Present tense to explain significance of results

In your discussion section, you will explain the significance of the results. The present tense is normally used for this. Example:

Removal of vegetation for agricultural purposes appears

to negatively affect the water quality of streams.

Past tense to summarize findings, with present tense to interpret results

Writers may use the past tense to summarize their findings, in combination with the present tense to explain or interpret what the results mean. Examples:

As the maxima and minima did not correspond to high and low tides, it is possible that the patterns observed may not be the result of mixing of waters with different concentrations.

Leaf carbon and phenolic content did not differ across sites, indicating that the response of secondary plant chemicals such as phenolics to water is complex.

In Example 1, the phrases ‘it is possible that’ and ‘may not be’ are used to indicate that other explanations are possible. This is an example of the use of limiting words to discuss findings in an academically tentative way.

Example 2 is less tentative. If you make a statement such as this, you are completely confident that your results and conclusion are correct.

A combination of tenses to highlight past research and future directions

In the final section of your thesis or report you summarize the main findings and the major implications of the study, point out any limitations, and offer suggestions for future research. To do these things you may use a combination of tenses. Example:

Although the study found evidence of tillage and irrigation within the study area, from the data collected it was not possible to determine if the effects of agriculture upstream cause (or caused) higher levels of total nitrogen downstream. Further studies are therefore necessary to determine the effects of agriculture on the health of Stringybark Creek.

Further Resources

Swales, J. M. & Feak, C. B. (2004). Academic Writing for Graduate Students. (2nd ed.). Ann Arbor: University of Michigan Press. (Pages 254-256).

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