Why Writers Search for “Is Then”
If you have typed “is then” into a search box because a sentence suddenly looks strange, the most useful answer is that the two words can absolutely appear together in correct English. The phrase is common in procedural and analytical writing: “The sample is then heated,” “The manuscript is then reviewed,” or “The question is then whether the evidence supports the claim.” Yet correctness depends on the entire sentence. Is is a form of the verb be, while then is usually an adverb. Their combination does not create a special grammar rule; it simply reflects how the verb and adverb happen to be positioned in a clause.
This matters for students, PhD scholars, researchers, and professional authors because a sentence can be grammatical and still be difficult to read. Academic prose asks readers to follow sequence, method, comparison, inference, and evidence precisely. If then means “next,” it should be obvious what the previous step was. If it means “in that case” or “therefore,” the reasoning before the sentence should justify that conclusion. If it refers to a time point, the time reference should be recoverable. When those relationships are vague, a reader may pause even though no simple grammar error is present.
The phrase also appears frequently in passive constructions, which are common in research methods and technical descriptions. “The data are cleaned and are then analyzed” clearly places analysis after cleaning. A shorter version—“The data are cleaned and then analyzed”—may read more smoothly. In an argument, “The issue is then whether…” can be acceptable, but “The next question is whether…” or “The issue, therefore, is whether…” may state the logical relationship more precisely. The best revision depends on what you mean, not on a blanket rule that bans or requires then.
This guide explains the main meanings of then, how “is then” behaves in different sentence patterns, punctuation and word-order choices, alternatives for formal writing, and mistakes that weaken clarity. It also shows how to edit the phrase in research methods, essays, theses, dissertations, reports, and manuscripts. Where a sentence-level question is part of a larger language problem, Contentxprtz provides academic editing services and scholarly proofreading support while keeping the author responsible for ideas, evidence, and final wording.
Quick Answer: Is “Is Then” Correct?
Yes. “Is then” can be grammatically correct when then modifies the clause by indicating sequence, time, or an inference. “The sample is then stored at 4°C” is a normal procedural sentence. “The issue is then whether the evidence is reliable” can work in formal argument.
Do not judge the phrase in isolation. Ask what then means in your sentence. If it means “next,” make the sequence clear. If it means “therefore,” make the reasoning clear. If the connection is vague, revise with a more exact transition or rewrite the sentence directly.
In academic writing, clarity is a better test than formality alone. Keep “is then” when it guides the reader efficiently; replace it when a more specific word or sentence structure states the relationship better.
Key Takeaways
- “Is then” is not inherently wrong; its correctness depends on the complete clause.
- Then can signal time, the next step, a consequence, an inference, or a summary.
- Procedural academic writing often uses “is then” naturally in passive constructions.
- Sequence is not the same as causation; “then” alone does not prove that one event caused another.
- In arguments, “therefore,” “thus,” or “the next question is” may sometimes be more precise.
- Do not replace “then” with a formal synonym unless the replacement matches the intended relationship.
- Revise the surrounding paragraph, not just the two words, when the logic is unclear.
What This Page Covers
- Meaning of “is then”
- Grammar and word order
- Academic method sentences
- Inference and consequence
- Punctuation choices
- Clearer alternatives
- Editing examples
Methodology and Academic Sources
This guide treats “is then” as a contextual grammar and academic-style question. It draws on established descriptions of then as an adverb of time, sequence, consequence, and discourse connection, and on academic-writing guidance about transitions and signposting. The discussion is designed to help writers decide whether a particular sentence communicates its relationship clearly rather than to impose a universal ban on one phrase.
For reference, see the Cambridge Grammar explanation of “then”, the Merriam-Webster definition of “then”, the MLA Style Center guidance on effective signposting, and Purdue Writing Lab guidance on document organization and transitions. University, journal, and discipline-specific style expectations may differ, so authors should also follow their own submission instructions.
What “Is Then” Means in Academic Context
“Is then” usually means that the verb is is followed by an adverb that positions the subject in time, sequence, or reasoning. The words should not be treated as one inseparable phrase. In “The solution is then filtered,” the grammatical core is “the solution is filtered.” Adding then tells the reader that filtration comes after a previous action. In “The problem is then one of measurement,” the core is “the problem is one of measurement,” while then signals that this characterization follows from the prior discussion.
Sequence
“The draft is then sent to the supervisor.” Here then means the next stage.
Time
“The result is then available for 30 days.” The adverb points to a particular time or stage.
Inference
“The question is then whether the model generalizes.” The phrase draws a next question from prior reasoning.
Discourse Summary
“The central finding, then, is limited in scope.” Commas may mark then as a parenthetical summative connector.
The last example is especially useful because punctuation changes the feel of the sentence. “The central finding is then limited” could be read as a time sequence: at that point, it becomes limited. “The central finding, then, is limited” more clearly signals an inference or summary. Punctuation cannot rescue weak logic, but it can help the reader identify the intended function.
The Main Uses of “Then” and Why They Matter
To edit “is then” well, first identify which meaning of then you need. Writers often sense that the phrase sounds wrong because the intended relationship has not been made explicit.
| Function | Example | What the reader understands | Possible alternative |
|---|---|---|---|
| Next step | The mixture is then cooled. | Cooling follows the previous procedure. | The mixture is subsequently cooled. |
| At that stage | The report is then available to reviewers. | Availability begins at a defined point. | At that stage, the report becomes available. |
| Inference | The issue is then whether bias remains. | The issue follows logically from prior analysis. | The next question is whether bias remains. |
| Consequence | If the criterion is met, the case is then included. | Inclusion follows the condition. | If the criterion is met, the case is included. |
| Summary | The conclusion, then, is provisional. | The writer is summing up an argument. | Therefore, the conclusion is provisional. |
Notice that not every alternative is “better.” “Subsequently” is more formal but longer. Removing then from a clear conditional can improve concision. A parenthetical “then” can be elegant in analytical prose, but “therefore” may state the logical force more explicitly. The editor’s task is to match wording to meaning.
How “Is Then” Works in Academic and Research Writing
“Is then” is especially common where academic writing describes an ordered procedure or develops a chain of reasoning. Those two uses should be distinguished because they carry different logical force.
In methods and procedures
A method section may say, “The pellet is then washed twice,” “The transcript is then coded independently,” or “The model is then evaluated on the test set.” These sentences are efficient because the passive construction keeps attention on the research object or process. The word then marks sequence. If the sequence is crucial for reproducibility, keep it or replace it with a more explicit stage marker. If the order is already established by numbered steps, repeating then in every sentence can become monotonous.
In arguments and interpretation
An analytical paragraph may use “The question is then whether…” after establishing a premise. This is not procedural time; it is rhetorical progression. The reader is being told what issue logically follows. Here, alternatives such as “The next question is whether,” “It follows that we must ask whether,” or “The issue, therefore, is whether” may reveal the argument more clearly. Use the stronger causal or inferential connector only when the logic actually warrants it.
In passive voice
Writers sometimes worry that “is then” sounds passive and therefore should always be removed. That is too simplistic. Passive voice can be useful when the object, process, or result deserves emphasis, when the actor is obvious, or when disciplinary convention favors procedural focus. “The sample is then analyzed” may be appropriate; “We then analyze the sample” may be equally appropriate in another journal. Follow the target publication’s style and choose the version that makes agency and sequence clear.
“Is Then,” “Then Is,” and Clearer Alternatives
Word order should follow sentence structure and emphasis, not a memorized preference. “Is then” is common when then sits inside or beside the predicate: “The revised document is then checked.” “Then is” can occur, but it often sounds marked because English declarative clauses normally place the subject before the verb. A rhetorical sentence such as “Then is the problem solved?” is possible, but academic prose will usually prefer “Is the problem solved then?” or, more directly, “Does this solve the problem?”
Writers also encounter “and is then.” This can be completely grammatical: “The paper is screened and is then assigned to an editor.” Repeating is may help maintain parallel structure, especially when the sentence is long. The more concise “The paper is screened and then assigned to an editor” often works just as well. Neither version should be chosen purely because one looks more formal.
| If you mean… | Try… | Use with care because… |
|---|---|---|
| Next step | is next; is subsequently; after this, is… | “Subsequently” can be unnecessarily heavy. |
| Logical result | therefore; thus; consequently | These imply stronger logic than simple sequence. |
| Next question | the next question is whether… | It may be clearer than “the question is then whether…” |
| At a time point | at that point; at that time; by that stage | A specific time is better when one is available. |
| Simple continuation | remove “then” | Do this only if the relationship remains obvious. |
In scholarly editing, the best alternative is often a structural rewrite rather than a synonym. A paragraph that uses then five times may need clearer topic sentences, stronger staging, or a more explicit description of causal relationships. The editing service can help with sentence flow when the problem extends beyond isolated grammar.
Step-by-Step: How to Edit a Sentence Containing “Is Then”
Use a meaning-first revision process. It prevents you from replacing a correct phrase with a more complicated but less accurate one.
- Find the grammatical core. Remove then temporarily. “The sample is then analyzed” becomes “The sample is analyzed.” If the core is incomplete or incorrect, fix that first.
- Name the relationship. Does then mean next, at that time, in that case, therefore, or by way of summary?
- Check the previous sentence. A transition must connect to something. If the earlier step or premise is missing, add the needed information rather than relying on then.
- Test a direct alternative. Compare “is then,” “is subsequently,” “the next step is,” “therefore,” and no transition. Choose the version that preserves the exact claim.
- Check punctuation. Parenthetical then in a summarizing use may be set off: “The conclusion, then, is limited.” Do not add commas automatically to every “is then” construction.
- Check repetition. If several nearby sentences use then, vary sentence openings or group the sequence more efficiently.
- Verify disciplinary meaning. In methods, do not change the order of operations. In analysis, do not strengthen association into causation. In a thesis or manuscript, follow required style guidance.
This kind of revision is particularly useful for ESL researchers because the issue may not be basic grammar at all. The intended relationship may be obvious in the writer’s first language but under-signaled in English. Ethical language editing should make that relationship visible without changing the author’s scientific or scholarly claim.
Common Mistakes to Avoid With “Is Then”
The biggest mistakes are usually logical or stylistic rather than simple grammar errors.
Using “then” when you mean “than”
Then generally relates to time, sequence, consequence, or discourse progression; than is used in comparisons. “The revised method is better than the original” is correct. “Better then the original” is not. The similarity in spelling makes this a frequent proofreading issue.
Using “then” to imply unsupported causation
“Participants slept less and anxiety was then higher” may describe a sequence or observation, but readers could infer a causal connection. If the study is observational, write the association precisely. Transitions should not make the claim stronger than the design supports.
Repeating “is then” in every procedural sentence
A series such as “The sample is then mixed. It is then heated. It is then cooled. It is then measured” is understandable but monotonous. Combine compatible steps, use temporal clauses, or vary the structure while preserving reproducibility.
Using a formal synonym mechanically
Replacing every then with subsequently does not make writing more scholarly. It can make prose heavier. Likewise, replacing a chronological then with therefore can introduce a causal or inferential meaning that was not intended.
Focusing on one phrase instead of the paragraph
If “The issue is then…” feels vague, the real problem may be that the previous paragraph did not establish the issue clearly. Good editing examines transitions across sentences and paragraphs. The MLA Style Center notes that signposts can support structure but become wordy when overused; the same principle applies here.
Practical Examples: Editing “Is Then” in Real Academic Sentences
These examples show how the correct choice depends on the writer’s intended relationship.
A PhD Method Section
Draft: “The extract is then centrifuged at 10,000 × g for 10 minutes.”
Assessment: Clear and grammatical. Then marks the next step, and the sentence includes reproducible detail.
Possible edit: Keep it, unless repeated transitions make the paragraph monotonous. Ethical editing should not alter the actual procedure.
A Research Argument
Draft: “The issue is then whether the correlation demonstrates causation.”
Assessment: Grammatical, but the intended inferential transition can be clearer.
Possible edit: “The next question is whether the correlation supports a causal interpretation.” This also avoids implying that correlation can simply “demonstrate” causation.
An ESL Student Essay
Draft: “The second study is then better then the first.”
Assessment: The first then may be unnecessary, and the comparison requires than.
Possible edit: “The second study is better than the first because it uses a larger sample.” The revision explains the comparison instead of relying on a vague transition.
Example 4: A Journal Manuscript Process
Draft: “The manuscript is checked by the corresponding author and is then submitted.” Both “and is then” and the shorter “and then submitted” are possible. If the repeated auxiliary helps distinguish a long first verb phrase, keep it. If not, remove the repetition for concision. The author should still confirm that the sequence accurately reflects the actual submission workflow.
Example 5: A Thesis Conclusion
Draft: “The contribution is then significant.” Without context, this is ambiguous: does then mean “at that time,” “therefore,” or “next”? If the writer is drawing a conclusion, “The contribution is therefore significant in two respects” is clearer—but only if the preceding evidence justifies that conclusion. Stronger transition words require stronger logical support.
Academic Editing Checklist for “Is Then”
Use this checklist before changing the phrase in a thesis, dissertation, research paper, report, or professional document.
Meaning
- Can I explain what then means here in one phrase: next, at that time, in that case, therefore, or summary?
- Does the previous sentence provide the step or premise that then refers to?
- Am I accidentally implying causation when I only mean sequence?
Grammar and Style
- Is the core sentence correct when then is temporarily removed?
- Would “is then,” “then is,” “and is then,” or a direct rewrite best fit ordinary English word order?
- Is punctuation appropriate to the intended use, especially for parenthetical “then”?
- Have I confused then with comparative than?
Academic Clarity
- Does the transition match the strength of the evidence?
- Is the phrase repeated so often that it weakens flow?
- Would a specific stage, date, condition, or action be clearer than a generic transition?
- Have I followed the university, supervisor, discipline, or journal style expected for the document?
When Self-Editing Is Enough and When Expert Editing Helps
A single “is then” question is often easy to solve yourself. If the sentence clearly describes the next step and reads naturally, there may be nothing to change. Free grammar tools can also catch obvious issues such as “then” versus “than,” duplicated words, or missing punctuation.
Expert editing becomes more useful when the phrase is part of a larger pattern: unclear transitions, repetitive passive constructions, weak paragraph flow, ESL language interference, ambiguous causal claims, or inconsistent academic tone. A thesis or manuscript may also need sentence-level corrections to preserve technical meaning while meeting publication expectations. Contentxprtz can provide ethical academic editing, manuscript assessment, or thesis editing support when those services match the document’s needs.
Need a Full Sentence or Manuscript Reviewed?
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Summary: Is Then Correct?
“Is then” can be correct, natural English. In procedural writing, it often marks the next action: “The sample is then analyzed.” In analytical writing, it can introduce a consequence, inference, or next question: “The issue is then whether…” The phrase should be evaluated in the complete sentence and paragraph.
The strongest revision principle is to identify the relationship first. Use then for sequence or time when it is clear. Use therefore, thus, or a more direct sentence when you truly mean a logical conclusion. Remove the transition when it adds no useful information. Keep chronological language separate from causal claims, and avoid replacing a simple word with a formal synonym merely to sound academic.
For students, PhD scholars, researchers, and authors, clarity matters more than obeying a mechanical preference. A grammar checker may flag a phrase, but only context can show whether the sentence accurately guides the reader through the method or argument.
Questions About “Is Then” in English and Academic Writing
These answers address grammar, word order, academic use, alternatives, and revision decisions for the keyphrase “is then.”
Is “is then” grammatically correct?
Yes, “is then” can be grammatically correct, but it is not a single fixed expression with one meaning. In many sentences, is is simply the verb and then is an adverb that modifies what happens at that point, next, or as a consequence. For example, “The sample is then transferred to a sterile tube” is natural because then marks the next stage of a procedure. “The question is then whether the evidence is sufficient” can also be grammatical in formal argument, where then means roughly “in that case” or “as a result of the preceding discussion.” The phrase becomes awkward when writers treat it as an all-purpose connector or place it where the reader cannot tell whether then refers to time, sequence, inference, or emphasis. In academic writing, keep “is then” when the logical relationship is clear; otherwise revise with a more precise alternative such as “is subsequently,” “the next step is,” “therefore,” “the issue is whether,” or a direct sentence without a transition. Read the sentence in context, because grammar depends on the whole clause, not just the two-word sequence.
What does “is then” mean in a sentence?
The meaning depends on the function of then. It may mean next in a sequence, as in “The manuscript is then sent for review”; at that time, as in “The result is then available to the committee”; or as a consequence or inference, as in “The central issue is then one of reliability.” In a method or process sentence, readers usually interpret “is then” as indicating the next procedural stage. In analytical prose, it can signal a conclusion drawn from what has just been established. Because one small word can carry several relationships, writers should check whether the intended connection is unmistakable. If the sentence is procedural, “next” or “subsequently” may be clearer. If it expresses a conclusion, “therefore,” “thus,” or a direct restatement may be better. The phrase itself does not automatically create logic; it only signals a relationship that the surrounding sentences must support. For dissertations, journal manuscripts, and professional reports, precision is more important than preserving a particular transition.
Is “is then” formal enough for academic writing?
It can be. Sentences such as “The solution is then filtered,” “The hypothesis is then tested,” or “The concern is then whether the measure captures the intended construct” can be appropriate in academic prose. What matters is whether the wording is precise, concise, and logically connected. Academic style does not require replacing every common transition with a longer formal synonym. In fact, “then” can be an efficient way to mark sequence, especially in methods, proofs, descriptions of procedures, and stepwise reasoning. Problems arise when “then” is overused, when the sequence is already obvious, or when it is asked to carry a stronger causal claim than the evidence supports. A researcher should not write “X occurred; Y is then caused by X” unless causation has actually been established. When revising, ask what relationship you mean: time, sequence, condition, result, inference, or summary. Choose a transition that names that relationship accurately. Professional academic editing can help identify places where a grammatically acceptable phrase still weakens clarity, flow, or disciplinary tone.
Should I write “then is” or “is then”?
Both orders can occur, but they serve different sentence structures. “Is then” commonly appears when is belongs to the main verb phrase and then follows it: “The article is then evaluated by two reviewers.” “Then is” is less common in ordinary prose and often appears in inversion, rhetorical questions, or constructions where then begins a clause: “Then is the conclusion justified?” Such structures may sound literary, rhetorical, or marked. Writers should not choose the order by memorizing a two-word rule. Instead, identify the subject and verb, then decide where the adverb naturally belongs. In straightforward academic prose, “is then” is often natural in passive sequential constructions, while a sentence beginning with “then” may be clearer if rewritten: “The next question is whether the conclusion is justified.” If you are unsure, rewrite for meaning rather than forcing either order. The best version is the one whose logic a reader understands immediately.
When should “then” come after the verb “is”?
Place “then” after “is” when that position clearly marks the stage, time, or inference associated with the subject. This is especially common in passive constructions: “The extract is then centrifuged,” “The application is then assessed,” and “The revised paper is then returned to the authors.” The position works because the reader first identifies the subject and its state or action, and then indicates where that action sits in a sequence. It also occurs in analytical writing: “The problem is then how to distinguish correlation from causation.” In that example, then connects the problem to the preceding reasoning. Avoid mechanical placement. If the sentence becomes heavy, “The next step is to centrifuge the extract” or “The problem, therefore, is how to distinguish…” may be easier to read. Adverb position in English is flexible, but clarity is not. Check the sentence before and after it to ensure the reader can identify what happens next and why that relationship matters.
Can I use “is then” in a research paper method section?
Yes. Method sections often describe ordered procedures, so “is then” can be useful: “The solution is then incubated for 20 minutes” or “The coded data are then compared across cases.” It tells the reader that the action follows the preceding step. However, a method section should be reproducible and exact, so transitions should not substitute for missing procedural information. State quantities, conditions, durations, instruments, thresholds, and decision rules where they matter. If every sentence contains “then,” the writing can become repetitive. Alternate sentence structures or group steps logically: “After incubation, the solution is centrifuged…”; “Next, the coded data are compared…”; or “The final stage compares…” Also distinguish sequence from causation. “Then” shows order, not necessarily that one step caused the next outcome. During editing, preserve technical meaning and discipline-specific conventions while improving flow. Authors remain responsible for verifying that the method accurately describes what was done.
Is “and is then” correct?
Yes, “and is then” is often correct when two coordinated actions share the same subject. For example, “The manuscript is screened for completeness and is then assigned to an editor” is grammatical. The second is can make the parallel structure explicit. Depending on rhythm, you could also write “The manuscript is screened for completeness and then assigned to an editor,” which is shorter and often smoother. The choice depends on whether repeating the auxiliary verb improves clarity. In a long sentence with several modifiers, the repeated is may help the reader see the second verb phrase. In a simple sentence, it may be unnecessary. Academic writers should also check whether the coordination accurately represents the process: if assignment happens only after a condition is met, say so rather than implying an automatic sequence. Revise for logic first and concision second. A sentence can be grammatically valid yet still benefit from a clearer structure.
What are better alternatives to “is then” in formal writing?
The best alternative depends on your meaning. For sequence, use “is subsequently,” “is next,” “the next step is,” or an “after” clause. For inference or consequence, consider “therefore,” “thus,” “consequently,” “the implication is,” or simply state the conclusion directly. For time, “at that point,” “at that time,” or a specific date or stage may be clearer. For framing a question, replace “the issue is then whether…” with “the issue, therefore, is whether…” or “the next question is whether…”. Do not replace a short phrase with a more formal word merely to sound academic. “Subsequently” can feel heavy when “then” is perfectly clear, while “therefore” is wrong if the relationship is only chronological. Good academic editing asks what the sentence actually claims and chooses a connector that matches that claim. The goal is not complexity; it is accurate guidance for the reader.
Does using “then” make a sentence causal?
No. “Then” often indicates sequence, not causation. “The participants completed the survey and were then interviewed” tells the reader what happened next. It does not claim that completing the survey caused the interviews in a scientific sense. In conditional statements, “then” can help express a consequence—“If the criterion is met, then the case is included”—but the logic comes from the conditional relationship, not from the word alone. This distinction matters in research writing because causal language requires appropriate design and evidence. A chronological sequence can tempt writers to imply causation accidentally. During revision, check verbs such as “caused,” “led to,” “resulted in,” and “produced” separately from transitions such as “then,” “next,” and “afterward.” If your evidence supports only timing or association, write that narrower claim. Clear transitions should make reasoning visible without overstating what the data demonstrate.
How can Contentxprtz help if I am unsure about phrases like “is then”?
Contentxprtz can review the sentence in its full academic context rather than judging a two-word phrase in isolation. An editor can identify whether “is then” is grammatically sound, whether the adverb refers clearly to sequence or inference, whether punctuation improves readability, and whether another transition better fits the discipline and argument. Support may also include sentence-level language editing, proofreading, consistency checks, paragraph flow, and attention to citation or formatting requirements where those services are relevant. Ethical editing should preserve the author’s research, evidence, reasoning, and intended meaning; it should not invent results or replace the author’s intellectual contribution. For a thesis, dissertation, research paper, or professional document, the useful question is not only “Is this phrase allowed?” but “Will my intended reader understand exactly what I mean?” The author should review all edits, confirm technical terminology, and follow any university or journal rules on external editing.
Use “Is Then” When It Makes the Relationship Clear
The practical problem behind “is then” is rarely whether two words are permitted to sit next to each other. The real issue is whether the sentence tells the reader exactly how one idea, stage, or conclusion connects to what came before. Self-editing is usually enough when the sequence is simple and unambiguous. Free language tools can help with obvious spelling and grammar errors, but they may not understand the intended logic of a research method or argument.
For higher-stakes academic work, expert-assisted editing can be useful when transition choices interact with sentence structure, disciplinary tone, methodology, causal interpretation, or publication readiness. The editor’s role is to improve clarity and readability while protecting the author’s intended meaning and intellectual responsibility. Authors should verify technical terms, claims, citations, and final wording against their university or journal requirements.
“At Contentxprtz, we don’t just edit; we help ideas reach their fullest potential.”