Common Mistakes with ‘therefore’ in Academic Writing

Many academic writers misuse ‘therefore’ by treating it as a simple connector like ‘so’ or by placing it incorrectly in a sentence. The most common error is using ‘therefore’ without a semicolon or period before it, which creates a run-on sentence. Another frequent mistake is overusing ‘therefore’ in places where a softer transition like ‘thus’ or ‘consequently’ would be more appropriate. This guide explains exactly how to use ‘therefore’ correctly, shows you the pitfalls to avoid, and gives you practical alternatives for formal and informal writing.

Quick Answer: How to Use ‘therefore’ Correctly

Use ‘therefore’ to show a logical result or conclusion. Place it after a semicolon or at the start of a new sentence. Always follow it with a comma when it begins a sentence. Do not use ‘therefore’ to connect two independent clauses without proper punctuation. For example: “The experiment failed; therefore, the hypothesis was rejected.” This is correct. “The experiment failed therefore the hypothesis was rejected” is wrong.

Why ‘therefore’ Causes Problems in Academic Writing

‘Therefore’ is a formal linking word that signals a strong cause-and-effect relationship. In academic writing, precision matters. When you use ‘therefore’, you are telling your reader that the second idea follows logically from the first. The problem is that many writers treat ‘therefore’ like the informal word ‘so’, which can be used more loosely. ‘So’ can begin a sentence in conversation or informal email, but ‘therefore’ demands a stricter structure. This difference in formality and punctuation is where most mistakes happen.

Formal vs. Informal Tone

‘Therefore’ belongs to formal writing: research papers, essays, reports, and professional emails. In everyday conversation or casual emails, ‘so’ or ‘that’s why’ sounds more natural. For example, in an email to a colleague, you might write: “The data was incomplete, so we need to run the test again.” In a formal essay, you would write: “The data was incomplete; therefore, the test must be repeated.” Mixing these tones can make your writing sound awkward or overly stiff.

Email and Conversation Context

In professional emails, ‘therefore’ is acceptable but should be used sparingly. Overusing it can make your message sound robotic. In conversation, ‘therefore’ is rare and often sounds unnatural. Native speakers usually say “so” or “that means” instead. If you are writing an email to a professor or a supervisor, one or two uses of ‘therefore’ per paragraph is fine. For a friendly email, avoid it entirely.

Comparison Table: ‘therefore’ vs. Common Alternatives

Natural Examples of ‘therefore’ in Academic Writing

Here are examples that show correct usage in real academic contexts.

• The sample size was too small to draw reliable conclusions; therefore, the study was repeated with a larger group.
• Carbon emissions have risen steadily over the past decade. Therefore, governments must implement stricter environmental policies.
• The patient showed no improvement after the first treatment; therefore, the doctor prescribed a different medication.
• All participants signed a consent form before the experiment began. Therefore, the study met ethical guidelines.

Notice that in each example, ‘therefore’ connects a clear cause to a logical result. The punctuation is either a semicolon before ‘therefore’ or a period to start a new sentence. A comma always follows ‘therefore’ when it begins a sentence.

Common Mistakes with ‘therefore’

Mistake 1: Missing Semicolon or Period

Incorrect: “The results were significant therefore the hypothesis was accepted.”
Correct: “The results were significant; therefore, the hypothesis was accepted.”
Correct: “The results were significant. Therefore, the hypothesis was accepted.”

This is the most frequent error. Without a semicolon or period, you create a run-on sentence. Always check your punctuation when using ‘therefore’.

Mistake 2: Using ‘therefore’ with a Comma Splice

Incorrect: “The temperature dropped, therefore, the plants froze.”
Correct: “The temperature dropped; therefore, the plants froze.”

A comma alone is not strong enough to join two independent clauses with ‘therefore’. You need a semicolon or a period.

Mistake 3: Overusing ‘therefore’ in One Paragraph

Incorrect: “The first experiment failed. Therefore, we changed the method. The new method worked better. Therefore, we used it for all trials. The results were clear. Therefore, we published the findings.”
Better: “The first experiment failed, so we changed the method. The new method worked better and was used for all trials. The results were clear; therefore, we published the findings.”

Using ‘therefore’ too often makes your writing repetitive and heavy. Use it only once or twice per paragraph, and rely on other transitions like ‘so’, ‘as a result’, or ‘consequently’ for variety.

Mistake 4: Using ‘therefore’ When the Connection Is Weak

Incorrect: “I read the book; therefore, I liked it.”
Better: “I read the book and liked it.”

‘Therefore’ implies a strong logical cause-and-effect relationship. If the connection is simply sequential or personal preference, a simpler connector is better.

Better Alternatives to ‘therefore’

When ‘therefore’ feels too formal or heavy, consider these alternatives:

• Thus – Slightly more formal than ‘therefore’, good for logical conclusions in academic writing. Example: “The data supported the theory; thus, the model was validated.”
• Consequently – Emphasizes the result of an action. Example: “The budget was cut; consequently, the project was delayed.”
• As a result – A phrase that works well in both formal and semi-formal writing. Example: “The team missed the deadline. As a result, the client withdrew the contract.”
• Hence – Very formal and slightly old-fashioned. Use sparingly. Example: “The evidence was inconclusive; hence, further research is needed.”
• So – Use in informal writing or conversation. Example: “The test was positive, so we moved to the next phase.”

Choose the alternative that matches the tone of your writing. In a formal essay, ‘thus’ or ‘consequently’ are safe choices. In an email to a colleague, ‘so’ or ‘as a result’ sound more natural.

When to Use ‘therefore’ (and When Not To)

Use ‘therefore’ when you want to emphasize a logical conclusion that follows directly from evidence. It is ideal for:

• Stating conclusions in research papers
• Summarizing arguments in essays
• Explaining results in lab reports
• Drawing inferences in formal discussions

Do not use ‘therefore’ when:

• The connection is weak or personal (use ‘so’ or ‘and’)
• You are writing a casual email or text message
• You have already used it in the same paragraph
• You want to show a sequence of events without a strong cause-effect link

Mini Practice: Test Your Understanding

Choose the correct option for each sentence. Answers are below.

1. The experiment produced consistent results ___ the team accepted the hypothesis.
   a) ; therefore,
   b) , therefore,
   c) ; therefore
2. ___ the sample was contaminated, the entire batch was discarded.
   a) Therefore
   b) So
   c) Therefore,
3. The theory was flawed ___ it was replaced by a new model.
   a) ; therefore,
   b) , therefore,
   c) ; therefore
4. Which sentence is correct?
   a) The data was incomplete therefore we could not proceed.
   b) The data was incomplete; therefore, we could not proceed.
   c) The data was incomplete, therefore, we could not proceed.

Answers

1. a) ; therefore, – Correct punctuation with semicolon and comma.
2. c) Therefore, – When ‘therefore’ starts a sentence, follow it with a comma.
3. a) ; therefore, – Semicolon before, comma after.
4. b) The data was incomplete; therefore, we could not proceed. – This is the only correct punctuation.

Frequently Asked Questions about ‘therefore’

1. Can I start a sentence with ‘therefore’?

Yes, you can. When ‘therefore’ begins a sentence, place a comma after it. Example: “Therefore, the results were considered valid.” This is common in academic writing.

2. What is the difference between ‘therefore’ and ‘thus’?

‘Therefore’ emphasizes a logical conclusion. ‘Thus’ is slightly more formal and can also mean “in this way.” For example: “The solution was heated; thus, the crystals dissolved.” Both are correct, but ‘thus’ is less common in modern writing.

3. Is it okay to use ‘therefore’ in the middle of a sentence?

Yes, but you need a semicolon before it and a comma after it. Example: “The survey had a high response rate; therefore, the data was reliable.” Do not use ‘therefore’ between a subject and verb without punctuation.

4. Can I use ‘therefore’ in a conclusion paragraph?

Yes, ‘therefore’ is very effective in conclusion paragraphs to state the final result of your argument. For example: “Therefore, the evidence strongly supports the need for policy reform.” Just avoid repeating it multiple times in the same paragraph.

For more help with academic transitions, explore our Essay Starters and Transition Word Examples. If you have questions about this guide, visit our FAQ or contact us. To learn about our standards, see our Editorial Policy.