50 Common English Grammar Mistakes and How to Correct Them

Introduction

English grammar mistakes are common for both beginners and intermediate English learners. Small mistakes with verbs, tenses, articles, prepositions, pronouns, and sentence structure can make your English less clear.

The good news is that many common mistakes can be corrected with regular practice. Learning the correct form and using it in your own sentences can gradually improve your English accuracy.

In this guide, we will look at 50 common English grammar mistakes, their corrections, and simple explanations.

1. Subject-Verb Agreement Mistakes

Subject-verb agreement means that the verb should match the subject of the sentence.

Mistake 1

❌ She work in a bank.

✅ She works in a bank.

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

Example:

He plays tennis every Sunday.

Mistake 2

❌ He go to school every day.

✅ He goes to school every day.

Why?
The subject he requires the third-person singular form goes.

Mistake 3

❌ They is ready.

✅ They are ready.

Why?
Use are with plural subjects such as they.

Mistake 4

❌ The students is studying.

✅ The students are studying.

Why?
Students is plural, so use are.

Mistake 5

❌ My brother and sister lives here.

✅ My brother and sister live here.

Why?
Two people joined by and form a plural subject, so use live.

2. Verb Tense Mistakes

Using the correct tense helps show when an action happens.

Mistake 6

❌ I go to the store yesterday.

✅ I went to the store yesterday.

Why?
Yesterday refers to the past, so use the past form went.

Mistake 7

❌ She is work at a hospital.

✅ She works at a hospital.

Why?
For a regular job or routine, the simple present works is appropriate.

Mistake 8

❌ I am knowing the answer.

✅ I know the answer.

Why?
Know is generally not used in the continuous form when describing a state of knowledge.

Mistake 9

❌ We have visited him yesterday.

✅ We visited him yesterday.

Why?
A specific finished time such as yesterday normally takes the simple past.

Mistake 10

❌ I am living here since 2020.

✅ I have been living here since 2020.

Why?
For an action that started in the past and continues to the present, the present perfect continuous can be used.

3. Articles: A, An, and The

Articles are small words, but they are important in English.

Mistake 11

❌ She is teacher.

✅ She is a teacher.

Why?
A singular countable profession normally needs an article.

Mistake 12

❌ He is a engineer.

✅ He is an engineer.

Why?
Use an before a vowel sound.

Mistake 13

❌ I bought new phone.

✅ I bought a new phone.

Why?
A singular countable noun generally needs a determiner such as a when it is introduced for the first time.

Mistake 14

❌ The life is difficult.

✅ Life is difficult.

Why?
When talking about life in general, an article is usually unnecessary.

Mistake 15

❌ I saw a dog. A dog was very friendly.

✅ I saw a dog. The dog was very friendly.

Why?
Use the when referring to something that has already been mentioned.

4. Pronoun Mistakes

Pronouns replace nouns and help make sentences less repetitive.

Mistake 16

❌ Me and John went to the office.

✅ John and I went to the office.

Why?
Use the subject pronoun I when it is part of the subject.

Mistake 17

❌ Please give the book to I.

✅ Please give the book to me.

Why?
Use the object pronoun me after the preposition to.

Mistake 18

❌ This is her's book.

✅ This is her book.

Why?
Her is used before a noun. Hers can be used independently.

Examples:

This is her book.

This book is hers.

Mistake 19

❌ Everyone should bring theirself.

✅ Everyone should bring themselves.

Why?
The reflexive pronoun commonly used with singular they is themselves.

Mistake 20

❌ The company changed it's policy.

✅ The company changed its policy.

Why?
Its shows possession. It's is a contraction of it is or it has.

5. Preposition Mistakes

Prepositions such as in, on, at, to, and for can be confusing.

Mistake 21

❌ I am good in English.

✅ I am good at English.

Why?
The common expression is good at.

Mistake 22

❌ I am interested on English.

✅ I am interested in English.

Why?
The correct expression is interested in.

Mistake 23

❌ She is married with a doctor.

✅ She is married to a doctor.

Why?
The standard expression is married to someone.

Mistake 24

❌ We discussed about the problem.

✅ We discussed the problem.

Why?
The verb discuss normally takes the topic directly without about.

Mistake 25

❌ I will meet you in Monday.

✅ I will meet you on Monday.

Why?
Use on with days and dates.

6. Countable and Uncountable Nouns

Some nouns can be counted, while others are generally treated as uncountable.

Mistake 26

❌ I need an advice.

✅ I need some advice.

Why?
Advice is generally uncountable.

You can also say:

I need a piece of advice.

Mistake 27

❌ She gave me many information.

✅ She gave me a lot of information.

Why?
Information is generally uncountable.

Mistake 28

❌ I have many homework.

✅ I have a lot of homework.

Why?
Homework is generally uncountable.

Mistake 29

❌ There are much people here.

✅ There are many people here.

Why?
People is a countable plural noun, so many is appropriate.

Mistake 30

❌ I bought two breads.

✅ I bought two loaves of bread.

Why?
Bread is generally uncountable when referring to the food as a substance.

7. Adjective and Adverb Mistakes

Adjectives describe nouns, while adverbs often describe verbs or how an action happens.

Mistake 31

❌ She speaks English good.

✅ She speaks English well.

Why?
Well is the adverb commonly used to describe how someone speaks.

Mistake 32

❌ He drives very careful.

✅ He drives very carefully.

Why?
The adverb carefully describes how he drives.

Mistake 33

❌ She is a beautifully singer.

✅ She is a beautiful singer.

Why?
Beautiful describes the noun singer, so an adjective is needed.

Mistake 34

❌ I feel badly today.

✅ I feel bad today.

Why?
After the linking verb feel, bad functions as an adjective describing the subject.

Mistake 35

❌ He is very tiredly.

✅ He is very tired.

Why?
Tired is an adjective describing how he feels.

8. Comparisons and Common Word Forms

Comparative and superlative forms need to be used correctly.

Mistake 36

❌ This book is more easier than that one.

✅ This book is easier than that one.

Why?
Do not use more with the comparative form easier.

Mistake 37

❌ She is more taller than me.

✅ She is taller than me.

Why?
Use taller, not more taller.

Mistake 38

❌ This is the most easiest question.

✅ This is the easiest question.

Why?
Easiest is already the superlative form.

Mistake 39

❌ My car is more fast than yours.

✅ My car is faster than yours.

Why?
For the adjective fast, use the comparative form faster.

Mistake 40

❌ This is the better option of the three.

✅ This is the best option of the three.

Why?
When comparing three or more things, the superlative best is generally used.

9. Questions and Negative Sentences

English questions and negative sentences often require auxiliary verbs.

Mistake 41

❌ Where you live?

✅ Where do you live?

Why?
Use do to form a simple present question with you.

Mistake 42

❌ She don't like coffee.

✅ She doesn't like coffee.

Why?
Use doesn't with he, she, and it.

Mistake 43

❌ He doesn't likes coffee.

✅ He doesn't like coffee.

Why?
After doesn't, use the base form of the verb.

Mistake 44

❌ Did you went there?

✅ Did you go there?

Why?
After did, use the base form of the verb.

Mistake 45

❌ I didn't saw him yesterday.

✅ I didn't see him yesterday.

Why?
After didn't, use the base form see.

10. Common Sentence Structure Mistakes

Correct sentence structure makes your English easier to understand.

Mistake 46

❌ I very like this movie.

✅ I like this movie very much.

Why?
Very much is commonly used after the verb phrase to emphasize how much you like something.

Mistake 47

❌ I have 25 years.

✅ I am 25 years old.

Why?
English uses be + age rather than have + age.

Mistake 48

❌ I am agree with you.

✅ I agree with you.

Why?
Agree is a verb, so we don't normally use am before it.

Mistake 49

❌ He explained me the problem.

✅ He explained the problem to me.

Why?
The standard structure is explain something to someone.

Mistake 50

❌ I look forward to meet you.

✅ I look forward to meeting you.

Why?
In look forward to, the word to is a preposition, so it is followed by a noun or -ing form.

Quick Review: 10 Common Grammar Rules

Here are some important rules to remember:

1. He/She/It + verb-s → She works.

2. I + am → I am ready.

3. They/We/You + are → They are ready.

4. A before a consonant sound → a teacher.

5. An before a vowel sound → an engineer.

6. Doesn't + base verb → She doesn't work.

7. Didn't + base verb → He didn't go.

8. Many + countable nouns → many books.

9. Much + uncountable nouns → much information.

10. Preposition + -ing → interested in learning.

How to Practice Grammar Correction

Knowing a grammar rule is only the first step. You also need to practice identifying and correcting mistakes.

Try this simple method:

Step 1: Read the sentence carefully.

Step 2: Identify the part that sounds incorrect.

Step 3: Think about the relevant grammar rule.

Step 4: Correct the sentence.

Step 5: Compare your answer with the correct sentence.

Step 6: Create a new sentence using the same rule.

Example

Incorrect:

She don't like tea.

Correction:

She doesn't like tea.

Practice:

She doesn't like coffee.

This process helps you understand the rule instead of simply memorizing the answer.

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Grammar correction practice is especially useful because it helps you recognize common mistakes and understand how to correct them.

Start Improving Your English Grammar

Making mistakes is a normal part of learning English. Instead of being afraid of mistakes, use them as opportunities to learn.

Review common grammar rules, practice correcting sentences, and use the corrected forms when speaking and writing.

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