Verb Tense Conventions in Research Papers

A manuscript that shifts verb tense at random reads as sloppy even when every sentence is grammatically correct on its own — readers use tense as a signal for what kind of claim they’re looking at: something the author did, something the data showed, or something the field now treats as established. Scholarly style guides, most explicitly the APA Publication Manual (7th edition), converge on a small set of section-by-section tense conventions rather than one fixed rule for the whole paper. This guide covers what those conventions are, why they differ by section, and where writers most often get them wrong.

The core principle: tense signals status, not just time

The underlying logic is simpler than the section-by-section list makes it look: past tense marks a specific, completed event (an experiment run, a survey administered, a result observed on a particular occasion); present tense marks something the writer is asserting as currently, generally true (an established fact, a stable relationship, the meaning of a finding as the author now understands it). A sentence like “the sample consisted of 42 participants” is past because enrollment was a one-time, dated event. A sentence like “temperature affects reaction rate” is present because it states a standing relationship, not something that happened once. Most tense errors in manuscripts come from treating every sentence as belonging to the same category rather than asking, for each one, which of the two it actually is.

Methods section: past tense

The methods section describes what the researchers actually did, on a specific occasion, to produce this study’s data — so it is written almost entirely in past tense: “Participants completed a survey,” “Samples were incubated for 48 hours,” “We recruited participants through…” This holds even when the procedure is a standard, reusable one (a validated instrument, a routine assay); the sentence is still reporting a specific instance of using it, not describing the instrument itself. The one common exception is a citation to a method described in a prior publication using present tense for the citation verb (“the protocol follows the approach described in Smith et al.”), though many style guides still prefer past tense here too (“followed”) for consistency with the rest of the section.

Results section: past tense, without exception

APA’s guidance is unusually strict on this section specifically: use past tense exclusively for reporting results, with no present-tense exceptions. “Results showed a significant effect,” “scores decreased over the study period,” “the hypothesis was not supported.” The reasoning is the same as for methods: a result is something that was observed in this specific dataset, at this specific time, under this specific analysis — it isn’t a standing fact until the field has independently corroborated it, so present tense would overstate its status. This is a place authors often slip, especially when a result feels obviously “true” and present tense feels more natural; the convention holds regardless of how confident the writer is in the finding.

Discussion section: present tense for meaning and implications

The discussion section is where tense shifts back to present, because its job is to interpret what the results mean now, in the writer’s current judgment — not to re-report what happened. “The results indicate that…”, “these findings suggest…”, “a limitation of the study is…”, “future research should explore…” The distinction from the results section is easy to lose: “scores decreased” (past, results) versus “this decrease indicates reduced engagement” (present, discussion) are doing different jobs even though they’re about the same data point. When restating a specific numeric result inside the discussion for context, past tense is still correct for that clause even mid-paragraph; the present tense belongs to the interpretive verb, not to the restated finding itself.

Literature review and citing others’ work: it depends on how settled the claim is

This is the section where mixed tense is not an error but the correct convention, because the choice of tense communicates something real about the claim’s status:

Past tense for describing a specific study as an event — what a particular set of authors did or found in that instance: “Martin (2020) examined the relationship between…”, “the study found no significant difference.”
Present perfect tense for summarizing a body of work across multiple studies, or work treated as ongoing/cumulative up to now: “Researchers have studied this relationship extensively,” “several studies have shown similar effects.”
Present tense for a finding or claim the writer is treating as settled, general knowledge rather than a one-off result: “Cognitive load increases with task complexity” (stated as an accepted principle, not attributed to a single dated study).

The choice among these three is a genuine authorial judgment, not a fixed rule — and it’s one of the few places where tense doubles as a citation-strength signal. Presenting a single, contested, or recent finding in present tense implicitly claims more consensus than a single study can support; APA and most journal style guides recommend reserving present tense in the literature review for claims that are genuinely well-established, and using past or present perfect tense for anything narrower.

Consistency within a paragraph

Whatever tense a given sentence’s role calls for, style guides are explicit that the chosen tense should stay consistent within a paragraph and across adjacent paragraphs discussing the same kind of material — unnecessary tense-switching mid-paragraph is flagged in copyediting and peer review even when each individual sentence is technically correct. The fix is usually to identify which “job” a sentence is doing (reporting an event, or asserting a current truth) and match its tense to that job, rather than to the sentence immediately before it.

Quick reference by section

Abstract: commonly mixed — past tense for what was done and found, present tense for background/purpose framing and for conclusions treated as current.
Introduction/background: present tense for established knowledge and the paper’s stated purpose (“this study aims to…”); past tense for prior specific studies.
Literature review: past tense for individual studies as events; present perfect for cumulative bodies of work; present tense for settled, general claims.
Methods: past tense throughout.
Results: past tense, without exception.
Discussion/conclusion: present tense for interpretation, implications, and limitations; past tense when restating a specific result for context; future (“will”)/present (“should”) for recommended future research.

Frequently asked questions

Is it ever correct to use future tense in a research paper?

Sparingly — mainly in recommendations for future research (“future studies should examine…”) or, in a pre-registration or protocol document, to describe procedures that haven’t happened yet. Reported results themselves are never future tense, since by the time they’re reported the events have already occurred.

Do journals outside APA style follow the same conventions?

The section-by-section logic — past tense for specific completed procedures and results, present tense for standing facts and current interpretation — is broadly shared across style guides used in scientific and social-science publishing, including guidance referenced by the ICMJE Recommendations for manuscript preparation, even where the exact wording differs from APA’s. Authors should still check a target journal’s specific style requirements, since some fields and journals have their own house conventions.

What’s the difference between past tense and present perfect tense in a literature review?

Past tense (“the study found”) reports a single, dated instance. Present perfect tense (“studies have found”) frames the same kind of claim as a pattern that has built up over time and remains relevant now — it’s the natural tense for summarizing several studies at once rather than describing one specific study’s design or result.

Why does the results section use past tense even for findings the author considers definitive?

Because tense in scientific writing marks the status of the claim within this study’s evidentiary chain, not the author’s confidence in it. A result only earns present-tense treatment once it’s being cited elsewhere as established background — within the paper reporting it for the first time, it is still a specific, dated observation, so it stays in past tense.