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TOEFL Writing Grammar Mistakes: Common Errors
Strong grammar is an important part of effective academic writing. In the TOEFL iBT Writing section, students are expected to communicate ideas clearly, organise information logically, and use accurate language. Even when the main ideas are relevant, frequent grammatical errors can make writing difficult to understand and affect the overall quality of a response.
Many test takers know English grammar rules but make mistakes when writing under time pressure. Errors involving verb tenses, subject-verb agreement, articles, sentence structure, punctuation, prepositions, and word forms are particularly common. These mistakes can make otherwise well-developed answers appear less polished.
The good news is that most grammar problems can be reduced through targeted practice. Instead of trying to learn every grammar rule before the exam, students can identify their recurring errors and develop a systematic proofreading routine.
This guide discusses the most frequent toefl writing grammar mistakes, explains why they occur, and provides practical ways to avoid them during the TOEFL iBT Writing section.
Why Grammar Matters in TOEFL iBT Writing
TOEFL writing is not simply about producing a large number of sentences. Your response should communicate ideas accurately and clearly. Grammatical problems can interfere with meaning, reduce sentence variety, and make arguments harder to follow.
For example:
Incorrect:
The students was interested in the research because it provide useful information.
Correct:
The students were interested in the research because it provided useful information.
The second sentence communicates the same idea more accurately and naturally.
Students do not need to use complicated grammar in every sentence. A combination of accurate simple sentences and well-controlled complex structures can make academic writing clearer and more effective.
1. Subject-Verb Agreement Errors
One of the most common grammar problems occurs when the subject and verb do not agree in number.
Incorrect:
The results of the study shows a significant difference.
Correct:
The results of the study show a significant difference.
The subject is “results,” which is plural, so the verb should be “show.”
Long subjects can make this error harder to notice. Consider:
Incorrect:
The introduction of new technologies in several industries have changed the workplace.
Correct:
The introduction of new technologies in several industries has changed the workplace.
The main subject is “introduction,” not “industries.”
How to avoid it
Before submitting your response, identify the subject of important sentences and check whether the verb agrees with it.
2. Incorrect Verb Tenses
TOEFL responses may require students to discuss past events, current situations, or general facts. Switching between tenses unnecessarily can create confusion.
Incorrect:
Researchers conducted the experiment last year and discover several important patterns.
Correct:
Researchers conducted the experiment last year and discovered several important patterns.
When describing a completed event, maintain the appropriate past tense.
However, general facts normally require the present tense:
Example:
Regular exercise improves cardiovascular health.
How to avoid it
Ask yourself when the action happened. Use past tense for completed events, present tense for general facts or current situations, and future forms when discussing expected outcomes.
3. Problems With Articles
Articles such as a, an, and the can be challenging, particularly for students whose first language does not use articles in the same way as English.
Incorrect:
University should provide students with practical skills.
Correct:
The university should provide students with practical skills.
Another example:
Incorrect:
Technology has become important part of modern education.
Correct:
Technology has become an important part of modern education.
How to avoid it
Pay attention to singular countable nouns. They often require an article or another determiner.
For example:
- a university
- an opportunity
- the research
- the government
- a solution
At the same time, not every noun requires an article. General plural nouns and many uncountable nouns can be used without one.
4. Sentence Fragments
A sentence fragment is an incomplete sentence that does not express a complete thought.
Incorrect:
Because students have access to online resources.
This is a dependent clause rather than a complete sentence.
Correct:
Students can conduct research more efficiently because they have access to online resources.
How to avoid it
Check that every sentence contains a complete thought. Be particularly careful with sentences beginning with words such as:
- Because
- Although
- While
- Since
- If
- When
These words often introduce dependent clauses that need to be connected to an independent clause.
5. Run-On Sentences
A run-on sentence occurs when you join two or more independent clauses incorrectly.
Incorrect:
Online education is convenient it allows students to study from home.
Correct:
Online education is convenient because it allows students to study from home.
You could also write:
Online education is convenient. It allows students to study from home.
How to avoid it
If a sentence contains two complete ideas, determine how they should be connected. You can use a full stop, semicolon, or an appropriate conjunction such as and, but, so, because, or although.
6. Incorrect Use of Prepositions
Prepositions can be difficult because their usage is often determined by established expressions.
For example:
Incorrect:
Students should focus in improving their writing skills.
Correct:
Students should focus on improving their writing skills.
Other commonly confused combinations include:
- interested in
- responsible for
- depend on
- contribute to
- benefit from
- concerned about
- capable of
How to avoid it
Learn common academic phrases as complete expressions instead of memorising isolated prepositions.
7. Confusing Singular and Plural Nouns
Students sometimes forget to make nouns plural when referring to more than one item.
Incorrect:
There are several advantage of online education.
Correct:
There are several advantages of online education.
The same issue can occur with irregular plural nouns.
Incorrect:
Many student believe that technology is useful.
Correct:
Many students believe that technology is useful.
How to avoid it
Check nouns after words such as:
- many
- several
- numerous
- various
- different
- a number of
These expressions are generally followed by plural countable nouns.
8. Incorrect Word Forms
Using the wrong form of a word can affect both grammar and meaning.
Incorrect:
The government should make education more access.
Correct:
The government should make education more accessible.
Another example:
Incorrect:
Technology has significantly development the education sector.
Correct:
Technology has significantly developed the education sector.
Students should distinguish between nouns, verbs, adjectives, and adverbs.
For example:
- develop — verb
- development — noun
- developed — adjective/verb form
- developing — adjective/verb form
How to avoid it
When learning new vocabulary, study related word forms together rather than memorising only one version.
9. Incorrect Comparative Structures
Comparisons are common in academic writing, particularly when discussing advantages and disadvantages.
Incorrect:
Online classes are more easier than traditional classes.
Correct:
Online classes are easier than traditional classes.
Do not use more with adjectives that already take the -er comparative form.
Another common error is:
Incorrect:
This method is more effective than the previous one.
This sentence is correct because “effective” normally uses “more.”
How to avoid it
Learn whether an adjective generally takes -er/-est or more/most.
10. Pronoun Errors
Pronouns must clearly refer to the appropriate noun.
Unclear:
When the university introduced the new policy, it received criticism.
The word “it” could potentially refer to either the university or the policy.
A clearer version would be:
When the university introduced the new policy, the policy received criticism from several students.
How to avoid it
After writing a response, check pronouns such as it, they, this, these, and those. Make sure the reader can immediately identify what each pronoun represents.
11. Punctuation Problems
Punctuation can influence readability. Common problems include missing commas, unnecessary commas, and incorrect sentence endings.
For example:
Incorrect:
Although online learning is convenient students may experience limited interaction.
Correct:
Although online learning is convenient, students may experience limited interaction.
Similarly, avoid inserting commas between a subject and its verb.
Incorrect:
The increasing use of technology in education, has changed teaching methods.
Correct:
The increasing use of technology in education has changed teaching methods.
12. Overusing Complex Sentences
Using complex grammar can demonstrate language control, but unnecessarily long sentences can increase the chance of errors.
Problematic:
Although many students believe that online education which has become increasingly popular because of technological development provides greater flexibility, it can also create several challenges that students who are not familiar with digital platforms may find difficult to overcome.
A clearer approach would be to divide the idea into two sentences.
Improved:
Many students believe that online education provides greater flexibility. However, students who are unfamiliar with digital platforms may face several challenges.
Clear writing is often more effective than complicated writing filled with grammatical errors.
Common TOEFL Grammar Mistakes Caused by Time Pressure
During the exam, students may know the correct grammar rules but make mistakes because they are concentrating on ideas and time management.
Some common toefl grammar mistakes caused by rushing include:
- Missing articles
- Forgetting plural endings
- Incorrect verb forms
- Missing words
- Repeated sentence structures
- Incorrect punctuation
- Incomplete sentences
- Typographical errors
A short proofreading period can help identify several of these problems.
A Simple Grammar-Checking Strategy
Instead of rereading your entire response without a specific purpose, use a structured review.
Step 1: Check verbs
Look for subject-verb agreement and tense consistency.
Step 2: Check nouns
Look for singular/plural errors and missing articles.
Step 3: Check sentences
Make sure every sentence expresses a complete thought and that independent clauses are properly connected.
Step 4: Check word forms
Look for incorrect noun, verb, adjective, and adverb forms.
Step 5: Check punctuation
Review commas, full stops, apostrophes, and sentence boundaries.
Step 6: Check clarity
Read the response once from the reader’s perspective. If a sentence feels difficult to understand, simplify it.
Other TOEFL iBT Writing Mistakes to Watch For
Grammar is only one aspect of effective writing. Students should also pay attention to other toefl ibt writing mistakes, including failing to answer the question directly, presenting poorly developed ideas, using weak examples, repeating the same vocabulary excessively, and creating paragraphs without clear connections.
A response should have a logical progression from the introduction to the supporting points and conclusion. Grammar practice should therefore be combined with regular work on organisation, vocabulary, coherence, and time management.
How to Improve Grammar Before the TOEFL Exam
Consistent practice is more useful than trying to memorise hundreds of rules immediately before the test.
Create an error log and record mistakes from your practice essays. Categorise them into areas such as articles, verbs, prepositions, sentence structure, and punctuation.
Then review your most frequent error types and practise writing sentences that use those structures correctly.
You can also improve by reading high-quality academic material. Pay attention to how writers construct sentences, introduce examples, compare ideas, and connect paragraphs.
Most importantly, practise under realistic time limits. This helps you develop the ability to maintain grammatical accuracy while generating ideas quickly.
Conclusion
Grammar plays an important role in making TOEFL iBT writing clear, accurate, and easy to follow. Mistakes involving subject-verb agreement, verb tenses, articles, sentence fragments, run-on sentences, prepositions, word forms, pronouns, and punctuation can reduce the overall quality of a response.
The solution is not to use complicated grammar in every sentence. Instead, focus on accuracy, sentence clarity, and appropriate variety. Identify your recurring mistakes, practise correcting them, and reserve a few minutes to proofread each response.
With regular practice and a systematic approach to reviewing errors, you can gradually reduce grammatical mistakes and produce more confident academic writing on test day.
Frequently Asked Questions
Is IELTS One Skill Retake available in India?
Not widely yet, but it will be rolled out to additional centres later in 2025.
Can I retake only IELTS Writing or Speaking?
Yes, you can retake a single module—Listening, Reading, Writing, or Speaking.
How can I avoid TOEFL writing grammar mistakes?
Keep an error log while practising, identify your most frequent mistakes, review the relevant grammar rules, and practise using those structures in your own sentences.
Should I use complicated grammar to get a higher TOEFL Writing score?
Not necessarily. Accurate and well-controlled sentences are more useful than complicated structures containing frequent errors. Use a mixture of simple and complex sentences where appropriate.
How important are articles such as “a,” “an,” and “the”?
Articles are an important part of English grammar, and incorrect usage can affect sentence accuracy. Pay particular attention to singular countable nouns and commonly used academic expressions.
Can verb tense mistakes affect my TOEFL Writing response?
Yes. Incorrect or inconsistent verb tenses can make the timing of events unclear. Choose the tense based on whether you are discussing past events, current situations, general facts, or future possibilities.
How can I improve sentence structure for TOEFL Writing?
Practise combining ideas using appropriate conjunctions and subordinating clauses. Also learn to identify incomplete sentences and run-on sentences during proofreading.
How much time should I spend checking grammar?
Reserve a few minutes at the end of your writing task for proofreading. Quickly check verbs, articles, plurals, sentence boundaries, word forms, and punctuation rather than trying to rewrite the entire response.
Are grammar mistakes the only errors that TOEFL Writing evaluates?
No. Effective writing also involves addressing the task, developing ideas, organising information logically, maintaining coherence, and using appropriate vocabulary and language.
What is the best way to practise TOEFL grammar before the exam?
Write timed practice responses regularly and review them afterward. Keep track of repeated errors and focus your grammar practice on those areas. Reading academic English can also help you become familiar with correct sentence patterns and vocabulary.
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