Common Mistakes with ‘therefore’ in Academic Writing
Many learners use therefore to show a logical result, but they often place it incorrectly, overuse it, or confuse it with other connectors. The most common mistake is treating therefore like a simple conjunction such as and or so, which leads to comma splices and run-on sentences. In academic writing, therefore is a formal adverb that needs proper punctuation and sentence structure to sound natural and correct.
Quick Answer: How to Use ‘therefore’ Correctly
Use therefore to introduce a conclusion or result. It usually appears after a semicolon or at the start of a new sentence. Do not join two independent clauses with only a comma before therefore. For example: The experiment failed; therefore, the hypothesis was rejected. Or: The experiment failed. Therefore, the hypothesis was rejected.
Understanding the Role of ‘therefore’
Therefore belongs to a group of linking words called conjunctive adverbs. It signals that what follows is a logical consequence of what came before. In academic writing, it is more formal than so and less formal than consequently or thus. You will find it in essays, research papers, reports, and formal emails.
Formal vs. Informal Tone
In formal writing, therefore is appropriate for conclusions and deductions. In informal conversation or casual emails, so or that’s why sounds more natural. For example:
- Formal: The data were inconclusive; therefore, further investigation is necessary.
- Informal: The data didn’t show much, so we need to look into it more.
Using therefore in everyday speech can make you sound stiff or overly academic. Reserve it for contexts where precision and formality matter.
Comparison Table: ‘therefore’ vs. Similar Linking Words
| Linking Word | Formality | Typical Position | Example |
|---|---|---|---|
| therefore | Formal | Start of clause after semicolon or period | The test was positive; therefore, treatment began. |
| so | Informal | Middle of sentence (conjunction) | The test was positive, so treatment began. |
| consequently | Very formal | Start of clause after semicolon or period | The test was positive; consequently, treatment began. |
| thus | Very formal | Start or middle of clause | The test was positive; thus, treatment began. |
| hence | Formal, slightly old-fashioned | Start of clause | The test was positive; hence, treatment began. |
Natural Examples of ‘therefore’ in Academic Writing
Here are examples that show correct placement and punctuation in different academic contexts.
In Essays
- The author argues that economic growth does not always reduce inequality; therefore, policy interventions are essential.
- Several studies have confirmed the link between sleep deprivation and reduced cognitive function. Therefore, students should prioritize rest during exam periods.
In Research Papers
- The sample size was too small to draw reliable conclusions; therefore, the results should be interpreted with caution.
- No significant difference was found between the two groups. Therefore, the null hypothesis cannot be rejected.
In Formal Emails
- We have reviewed your application and noted that some documents are missing; therefore, we cannot process your request until they are submitted.
- The meeting has been rescheduled to Friday. Therefore, please update your calendar accordingly.
Common Mistakes with ‘therefore’
Mistake 1: Using a Comma Splice
Incorrect: The results were unexpected, therefore, we repeated the experiment.
Correct: The results were unexpected; therefore, we repeated the experiment.
Correct: The results were unexpected. Therefore, we repeated the experiment.
When you join two complete sentences with only a comma, it creates a comma splice. Use a semicolon or a period before therefore.
Mistake 2: Overusing ‘therefore’
Using therefore in every paragraph makes your writing repetitive. Vary your linking words. For example, use consequently, as a result, or for this reason occasionally. Check our Linking Words by Purpose section for more options.
Mistake 3: Placing ‘therefore’ in the Wrong Position
Therefore can appear at the beginning, middle, or end of a clause, but beginners often put it in awkward spots.
- Natural: The policy was unpopular; therefore, it was revised.
- Awkward: The policy was unpopular; it was, therefore, revised.
The middle position is acceptable but less common. Stick to the beginning for clarity.
Mistake 4: Using ‘therefore’ with ‘because’
Incorrect: Because the data was incomplete, therefore, we could not proceed.
Correct: Because the data was incomplete, we could not proceed.
Correct: The data was incomplete; therefore, we could not proceed.
Using both because and therefore in the same sentence is redundant. Choose one.
Better Alternatives to ‘therefore’
Sometimes therefore is not the best choice. Here are alternatives depending on context.
When to Use ‘therefore’
- You want a formal, direct result.
- You are writing an academic essay or report.
- You need a clear logical connection.
When to Use Alternatives
- So: Use in informal writing or speech. Example: It was raining, so we stayed inside.
- Consequently: Use for a stronger cause-effect relationship, often with negative outcomes. Example: The factory closed; consequently, many workers lost their jobs.
- Thus: Use in very formal writing, often to show a method or conclusion. Example: The solution was heated; thus, the crystals dissolved.
- As a result: Use to emphasize the outcome. Example: He missed several deadlines. As a result, his contract was terminated.
- For this reason: Use to explain the rationale. Example: The cost was too high. For this reason, the project was abandoned.
For more guidance on choosing the right word, visit our Transition Word Examples page.
Mini Practice: Check Your Understanding
Rewrite each sentence correctly. Answers are below.
- The survey had a low response rate, therefore, the results are not reliable.
- Because the budget was cut, therefore, we had to reduce staff.
- The theory was tested multiple times. Therefore it was accepted.
- She studied hard; therefore she passed the exam.
Answers
- The survey had a low response rate; therefore, the results are not reliable. (Or: The survey had a low response rate. Therefore, the results are not reliable.)
- Because the budget was cut, we had to reduce staff. (Remove therefore.)
- The theory was tested multiple times. Therefore, it was accepted. (Add a comma after Therefore.)
- She studied hard; therefore, she passed the exam. (Add a comma after therefore.)
FAQ: Common Questions About ‘therefore’
1. Can I start a sentence with ‘therefore’?
Yes, starting a sentence with therefore is correct in academic writing. Always follow it with a comma. Example: Therefore, the experiment was repeated.
2. Do I need a comma after ‘therefore’?
Yes, when therefore begins a clause, place a comma after it. When it appears in the middle of a clause, commas around it are optional but recommended for clarity. Example: The results, therefore, were inconclusive.
3. Is ‘therefore’ the same as ‘so’?
No. So is a coordinating conjunction that can join two clauses with a comma. Therefore is a conjunctive adverb that requires a semicolon or period. So is less formal and more common in speech.
4. Can I use ‘therefore’ in a conclusion paragraph?
Yes, therefore is excellent for conclusions because it signals a final deduction. For example: Therefore, the evidence supports the original hypothesis. For more tips on essay structure, see our Essay Starters category.
Final Tips for Using ‘therefore’
To avoid common mistakes, remember these three rules:
- Never join two sentences with only a comma before therefore.
- Do not use therefore together with because.
- Use therefore sparingly to maintain its impact.
If you are unsure about your usage, read your sentence aloud. If it sounds unnatural, try a different linking word. For more help with common writing issues, explore our Common Writing Mistakes section. And if you have further questions, feel free to contact us.
