Grammar Correction Practice: Can You Correct These 20 English Sentences?

Introduction

Improving English grammar becomes easier when you regularly practice identifying and correcting mistakes. Grammar correction exercises help you understand common errors in verbs, tenses, articles, prepositions, pronouns, and sentence structure.

In this article, you will find 20 English sentences with common grammar mistakes. Try correcting each sentence yourself before checking the answer and explanation.

This practice is useful for English beginners, students, job seekers, and anyone who wants to improve everyday English communication.

1. Subject-Verb Agreement

The subject and verb must agree in number. Singular subjects generally take singular verbs, while plural subjects take plural verbs.

Example

Incorrect: She work in a bank.
Correct: She works in a bank.

Why?
“She” is singular, so the present-tense verb should be “works.”

2. Simple Present Tense

Use the simple present for regular activities, habits, and general facts.

Example

Incorrect: He go to school every day.
Correct: He goes to school every day.

Why?
With “he,” “she,” or “it,” the verb usually takes -s or -es in the simple present.

3. Verb "To Be"

Make sure the correct form of “be” is used with the subject.

Example

Incorrect: They is ready for the test.
Correct: They are ready for the test.

Why?
“They” is plural, so we use “are,” not “is.”

4. Simple Past Tense

Use the simple past for completed actions in the past.

Example

Incorrect: I go to the market yesterday.
Correct: I went to the market yesterday.

Why?
“Yesterday” indicates a past action, so “go” should change to its past form, “went.”

5. Present Continuous Tense

Use the present continuous for actions happening now or around the current time.

Example

Incorrect: She cook dinner right now.
Correct: She is cooking dinner right now.

Why?
The present continuous uses am/is/are + verb-ing.

6. Articles: A and An

Use a before a consonant sound and an before a vowel sound.

Example

Incorrect: He is a engineer.
Correct: He is an engineer.

Why?
“Engineer” begins with a vowel sound, so “an” is used.

7. Articles: A, An, and The

Use “the” when referring to something specific or already mentioned.

Example

Incorrect: I saw a dog. A dog was very friendly.
Correct: I saw a dog. The dog was very friendly.

Why?
The second sentence refers to the specific dog already mentioned.

8. Pronouns

Use the correct pronoun depending on its role in the sentence.

Example

Incorrect: Me and John went to the library.
Correct: John and I went to the library.

Why?
“I” is used as the subject of the sentence. “Me” is normally used as an object.

9. Possessive Words

Use possessive adjectives correctly to show ownership.

Example

Incorrect: This is her's book.
Correct: This is her book.

Why?
“Her” is used before a noun. We do not add an apostrophe to “her” in this construction.

10. Prepositions

Different words commonly require specific prepositions.

Example

Incorrect: She is interested on English.
Correct: She is interested in English.

Why?
The standard expression is interested in something.

20 Grammar Correction Questions

Try to correct each sentence before looking at the answer.

Question 1

Incorrect: He play football every Sunday.

Correct: He plays football every Sunday.

Explanation: “He” is singular, so the simple present verb takes -s.

Question 2

Incorrect: They was very happy yesterday.

Correct: They were very happy yesterday.

Explanation: “They” takes “were” in the past tense.

Question 3

Incorrect: I am go to work now.

Correct: I am going to work now.

Explanation: The present continuous uses am/is/are + verb-ing.

Question 4

Incorrect: She don't like coffee.

Correct: She doesn't like coffee.

Explanation: With “she,” use doesn't, followed by the base verb “like.”

Question 5

Incorrect: We visited the museum tomorrow.

Correct: We will visit the museum tomorrow.

Explanation: “Tomorrow” refers to the future, so a future form is needed.

Question 6

Incorrect: I have a umbrella.

Correct: I have an umbrella.

Explanation: “Umbrella” begins with a vowel sound, so use “an.”

Question 7

Incorrect: He is good in mathematics.

Correct: He is good at mathematics.

Explanation: The standard expression is good at a subject or skill.

Question 8

Incorrect: She can speaks English very well.

Correct: She can speak English very well.

Explanation: After modal verbs such as “can,” use the base form of the verb.

Question 9

Incorrect: Did you went to the office?

Correct: Did you go to the office?

Explanation: After “did,” use the base form “go,” not the past form “went.”

Question 10

Incorrect: He doesn't likes pizza.

Correct: He doesn't like pizza.

Explanation: After “doesn't,” use the base form of the verb.

Question 11

Incorrect: There is many students in the classroom.

Correct: There are many students in the classroom.

Explanation: “Students” is plural, so use “are.”

Question 12

Incorrect: I need an advice.

Correct: I need some advice.

Explanation: “Advice” is generally uncountable, so we do not normally say “an advice.”

Question 13

Incorrect: She speaks English very good.

Correct: She speaks English very well.

Explanation: “Well” is an adverb that describes how she speaks.

Question 14

Incorrect: My brother is taller than me is.

Correct: My brother is taller than me.

Explanation: The extra “is” makes the sentence grammatically incorrect.

Question 15

Incorrect: I am agree with you.

Correct: I agree with you.

Explanation: “Agree” is a verb. We do not normally use “am” before it.

Question 16

Incorrect: He explained me the problem.

Correct: He explained the problem to me.

Explanation: The usual structure is explain something to someone.

Question 17

Incorrect: She has lived here since five years.

Correct: She has lived here for five years.

Explanation: Use for with a period of time and since with a starting point.

Question 18

Incorrect: I am interested to learn English.

Correct: I am interested in learning English.

Explanation: The common structure is interested in + noun/verb-ing.

Question 19

Incorrect: She didn't went to school today.

Correct: She didn't go to school today.

Explanation: After “didn't,” use the base form “go.”

Question 20

Incorrect: I look forward to meet you.

Correct: I look forward to meeting you.

Explanation: In “look forward to,” “to” is a preposition, so it is followed by a noun or verb-ing form.

How to Improve Your Grammar Correction Skills

Grammar correction becomes easier when you practice regularly instead of simply memorizing rules.

Try these simple techniques:

1. Find the Error

Read the complete sentence and identify what sounds incorrect.

2. Identify the Grammar Rule

Ask yourself whether the problem is related to a verb, tense, article, pronoun, preposition, or sentence structure.

3. Correct the Sentence

Rewrite the complete sentence instead of changing only one word.

4. Understand the Reason

Knowing why the correction is needed helps you avoid making the same mistake again.

5. Practice Regularly

Spend 10–15 minutes each day correcting English sentences. Regular practice can gradually improve grammar accuracy.

Quick Grammar Review

Here are some useful rules to remember:

• He works, but they work.

• She is, but they are.

• Use did + base verb: Did you go?

• Use doesn't + base verb: She doesn't like it.

• Use can + base verb: He can speak.

• Use an before a vowel sound: an apple.

• Use a before a consonant sound: a book.

• Use for with a period: for five years.

• Use since with a starting point: since 2020.

• Use verb-ing after “look forward to”: look forward to meeting.

Practice Grammar Correction with PrepMento

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PrepMento helps you improve your English through interactive learning activities, including grammar quizzes and grammar correction practice.

You can practice common grammar mistakes, review corrections, understand explanations, and build your English skills through regular practice.

Whether you are preparing for exams, improving your communication skills, or getting ready for a job interview, consistent English practice can help you become more confident.

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