Common Grammar Mistakes in English Exams (With Fixes)

Grammar errors can significantly lower your English exam score, even if you have a strong command of the language. Many students make the same mistakes repeatedly, often without realizing them. Whether you are preparing for the IELTS, TOEFL, Cambridge, or any other English proficiency test, understanding these common grammar pitfalls—and how to fix them—can make a huge difference.

In this detailed guide, we will explore the most frequent grammar mistakes made in English exams, explain why they happen, and provide corrected examples to help you master them before test day.

1. Subject-Verb Agreement Errors

Mistake:

❌ The students was excited about the test.
❌ Each of the books are expensive.

Correction:

✅ The students were excited about the test.
✅ Each of the books is expensive.

Why?

• A singular subject requires a singular verb (Each of the books is...).

• A plural subject requires a plural verb (The students were...).

• Be careful with indefinite pronouns (e.g., everyone, somebody, each), as they are always singular.

💡 Tip: Always identify the true subject of the sentence before choosing the verb.

2. Misusing Tenses

Mistake:

❌ Yesterday, I go to the library.
❌ She has finished her homework last night.

Correction:

✅ Yesterday, I went to the library.
✅ She finished her homework last night.

Why?

• Past simple is used for completed actions with a specific past time (Yesterday, last night).

• Present perfect (has/have + past participle) is used for actions with no specific time reference or that are still relevant to the present.

💡 Tip: If a sentence has a time marker (yesterday, last year), avoid the present perfect tense.

3. Wrong Use of Prepositions

Mistake:

❌ I am interested on learning English.
❌ She is married with a doctor.

Correction:

✅ I am interested in learning English.
✅ She is married to a doctor.

Why?

Some verbs, adjectives, and nouns require specific prepositions. Memorizing common collocations will help:

• Interested in

• Good at

• Married to

• Afraid of

💡 Tip: When in doubt, check a collocation dictionary or read native-level texts to see how prepositions are used.

4. Confusing "Since" and "For"

Mistake:

❌ I have lived here since five years.
❌ He has been working for 2010.

Correction:

✅ I have lived here for five years.
✅ He has been working since 2010.

Why?

• Since is used with a specific point in time (e.g., since 2010).

• For is used with a duration (e.g., for five years).

💡 Tip: If you can replace it with "over the last X years," use for. If you're pointing to a specific year or date, use since.

5. Misplacing Adverbs

Mistake:

❌ She speaks English fluent.
❌ I eat sometimes pizza.

Correction:

✅ She speaks English fluently.
✅ I sometimes eat pizza.

Why?

• Adverbs usually modify verbs and should be placed before the main verb (I sometimes eat pizza).

• If the sentence has an auxiliary verb (is, was, have), the adverb usually goes after the auxiliary (She has always been kind).

💡 Tip: Learn common adverb placement rules to avoid sounding unnatural.

6. Wrong Use of Comparatives and Superlatives

Mistake:

❌ She is more taller than me.
❌ This is the most easiest question.

Correction:

✅ She is taller than me.
✅ This is the easiest question.

Why?

• Do not use "more" with adjectives that already end in "-er" (taller, bigger, faster).

• Use "more" with adjectives with 3+ syllables (more beautiful, more interesting).

💡 Tip: If in doubt, check whether the adjective already has a comparative form before adding "more."

7. Using the Wrong Conditional Structure

Mistake:

❌ If I will be late, call me.
❌ If I was you, I would accept the job.

Correction:

✅ If I am late, call me.
✅ If I were you, I would accept the job.

Why?

• In zero and first conditionals, use the present simple in the "if" clause.

• In second conditionals (hypothetical situations), use "were" instead of "was" (If I were you).

💡 Tip: Memorize the four conditional structures to use them correctly.

8. Incorrect Use of "Who" vs. "Whom"

Mistake:

❌ Who did you give the book to?
❌ Whom is calling me?

Correction:

✅ Whom did you give the book to?
✅ Who is calling me?

Why?

• "Who" is used for the subject (Who called you?).

• "Whom" is used for the object (Whom did you call?).

💡 Tip: If you can replace it with he/she, use who. If you can replace it with him/her, use whom.

Final Thoughts

Grammar mistakes in English exams can cost you valuable points, but by identifying your weak areas and practicing regularly, you can avoid these common pitfalls. Make sure to:
✅ Review grammar rules frequently.
✅ Practice with mock tests.
✅ Pay attention to collocations and idioms.
✅ Read and listen to native English content.

By implementing these strategies, you’ll significantly improve your grammar accuracy and boost your exam performance.