Have you ever written an English sentence and wondered, “Does this sound right?” You may know the words you want to use, but putting them together correctly can sometimes be challenging.

The good news is that you don't need complicated grammar to write clearly. By learning to recognize a few common mistakes, you can make your English sentences more accurate and natural.

In this post, we'll look at five grammar mistakes that English learners often make, with simple explanations, examples, and practice activities.

1. Subject–Verb Agreement

One of the most common mistakes is using the wrong verb form with a subject.

In the present simple, we usually add -s or -es to the verb when the subject is he, she, or it.

Examples:

❌ She work in a hospital.

✅ She works in a hospital.

❌ My brother and sister lives in Da Nang.

✅ My brother and sister live in Da Nang.

Remember: A singular subject takes a singular verb form, while a plural subject generally takes a plural verb form.

Quick tip: Before writing a sentence, identify the subject and check whether the verb agrees with it.

2. Countable and Uncountable Nouns

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

For example:

• Countable: book, student, apple
• Uncountable: information, advice, furniture

We use many with plural countable nouns and much with uncountable nouns.

Examples:

❌ I have many informations about the course.

✅ I have a lot of information about the course.

❌ She gave me an advice.

✅ She gave me some advice.

Remember: Don't add -s to uncountable nouns such as information and advice when using them in their usual meanings.

3. Articles: A, An, and The

Articles may be small words, but they can make a big difference in your writing.

• A comes before a singular countable noun beginning with a consonant sound.
• An comes before a singular countable noun beginning with a vowel sound.
• The refers to a particular person or thing that the reader can identify.

Examples:

❌ She is teacher.

✅ She is a teacher.

❌ He bought a umbrella.

✅ He bought an umbrella.

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

The first sentence introduces a dog. The second refers to that same dog.

Remember: We generally need an article or another determiner before a singular countable noun.

4. Run-On Sentences

Sometimes, learners put too many ideas into one sentence without connecting them correctly.

Example:

❌ I was tired I went to bed early.

This sentence contains two complete ideas, but they are not properly connected.

Here are two ways to correct it:

✅ I was tired, so I went to bed early.

✅ I was tired. I went to bed early.

You can also use words such as because, but, and although to connect ideas logically.

Remember: A longer sentence is not always a better sentence. Focus on making your ideas clear and easy to follow.

5. Confusing Adjectives and Adverbs

Adjectives describe nouns, while adverbs often describe verbs, adjectives, or other adverbs.

Compare:

• She is a careful driver. (Careful describes the noun driver.)
• She drives carefully. (Carefully describes the verb drives.)

Common mistakes:

❌ He speaks English very good.

✅ He speaks English very well.

❌ She is a beautifully singer.

✅ She is a beautiful singer.

Remember: After linking verbs such as be, seem, and feel, we commonly use adjectives.

For example: I feel happy, not I feel happily.

However, not all adverbs end in -ly. For example, fast can be both an adjective and an adverb: a fast car and drive fast.

 

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✏️ Mini Practice: Can You Find the Mistakes?

Choose the correct answer for each question.

1. My best friend _____ English every evening.

A. study
B. studies
C. studying

2. The teacher gave us some useful _____.

A. advices
B. an advice
C. advice

3. She wants to buy _____ new laptop.

A. a
B. an
C. the

4. I missed the bus, _____ I arrived late for class.

A. because
B. so
C. although

5. Tom completed the task _____.

A. successful
B. success
C. successfully

Answer Key

1. B. studies — My best friend is singular.
2. C. advice — Advice is uncountable.
3. A. a — New begins with a consonant sound.
4. B. so — So introduces the result.
5. C. successfully — The adverb describes how Tom completed the task.

 

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Final Tip 💡

Improving your writing doesn't mean memorizing every grammar rule at once. Start by checking five things whenever you finish writing:

1. Does the verb agree with the subject?
2. Have I used countable and uncountable nouns correctly?
3. Do I need an article?
4. Have I connected my ideas properly?
5. Have I chosen the correct adjective or adverb?

You can even use this checklist when writing emails, assignments, or social media posts in English.

The secret to better writing is not writing perfectly the first time. It's learning to notice your mistakes and correcting them. Keep practicing, and your sentences will become clearer and more accurate, one step at a time!