10 English Grammar Rules That Fix Most Beginner Mistakes

Priya Sharma

Priya Sharma writes English learning guides for ESL students. Pune-based language enthusiast.

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Quick answer: Most beginner mistakes come from ten rules: subject-verb agreement, the third-person -s, articles, uncountable nouns, past simple vs present perfect, question word order, adjective order, in/on/at for time, few vs a few, and double negatives. Practice one rule a day with five sentences about your own life.↗ Share on X

Most beginner English mistakes come from about ten rules: subject-verb agreement, the third-person "s", articles (a, an, the), countable vs uncountable nouns, the past simple vs present perfect, word order in questions, adjective order, prepositions of time, "few" vs "a few", and double negatives. Learn these ten, practice each one with five of your own sentences, and your writing and speaking will sound much more natural within a few weeks. Below, each rule has a short explanation, a wrong example, a correct example and a quick test.

Rule 1: Does the verb match the subject?

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The verb must match the subject in number. One person or thing takes a singular verb. Two or more take a plural verb.

• ❌ *The list of names are on the desk.*
• ✅ *The list of names is on the desk.*

The trap is the words in the middle. "Of names" is not the subject. The subject is "the list" — one list — so the verb is "is."

Quick test: cover the words between the subject and the verb. Read what's left: "The list… is on the desk." Now it sounds right.

Rule 2: Why do "he", "she" and "it" need an "s"?

In the present simple, add -s or -es to the verb when the subject is he, she, it, or one person or thing.

• ❌ *She work in a hospital.*
• ✅ *She works in a hospital.*
• ❌ *My brother don't like coffee.*
• ✅ *My brother doesn't like coffee.*

Notice the second pair. With "does" or "doesn't," the main verb goes back to its base form: *doesn't like*, not *doesn't likes*.

Rule 3: When do you use "a", "an" or "the"?

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It's about the sound, not the letter. "University" starts with a "yoo" sound, so it's *a university*. "Hour" starts with a silent h, so it's *an hour*.

• ❌ *I need the advice.* (when talking about advice in general)
• ✅ *I need some advice.*

Rule 4: Can you count it?

Countable nouns can be counted: one chair, two chairs. Uncountable nouns can't: water, information, advice, furniture, homework, money, news.

Uncountable nouns:

• never take "a" or "an"
• never take a plural -s
• use "much," "a little," "some" instead of "many" or "a few"

• ❌ *Can you give me some informations?*
• ✅ *Can you give me some information?*
• ❌ *I have many homeworks.*
• ✅ *I have a lot of homework.*

To count an uncountable noun, add a container word: *a piece of advice, two bottles of water, three items of furniture*.

Rule 5: Past simple or present perfect?

This one confuses almost every learner.

• ❌ *I have visited Chicago in 2021.*
• ✅ *I visited Chicago in 2021.*

The rule of thumb: if you say *when*, use the past simple.

Rule 6: How do you build a question?

In most English questions, the helper verb comes before the subject.

Word order: (Question word) + helper verb + subject + main verb

• ❌ *Where you live?*
• ✅ *Where do you live?*
• ❌ *Why she is late?*
• ✅ *Why is she late?*

But in indirect questions (a question inside a sentence), the order goes back to normal:

• ❌ *Can you tell me where is the station?*
• ✅ *Can you tell me where the station is?*

Rule 7: What order do adjectives go in?

When you use more than one adjective, English speakers follow a natural order. Breaking it sounds strange, even if nobody can explain why.

1. Opinion — *beautiful, ugly*

2. Size — *big, small*

3. Age — *old, new*

4. Shape — *round, square*

5. Color — *red, blue*

6. Origin — *Italian, Mexican*

7. Material — *wooden, cotton*

8. Purpose — *sleeping (bag), running (shoes)*

• ❌ *a red big car*
• ✅ *a big red car*
• ✅ *a lovely old wooden table*

In real life, people rarely use more than two or three adjectives together. Learn the order for the first five and you'll handle almost every sentence.

Rule 8: In, on or at for time?

Think of it as moving from big to small.

• ❌ *See you in Friday.*
• ✅ *See you on Friday.*

Americans say *on the weekend*; British speakers usually say *at the weekend*. Both are correct in their own country.

Rule 9: Why do "few" and "a few" mean opposite things?

Both mean a small number, but the feeling is opposite.

• a few = some, enough, positive. *I have a few friends here, so I'm not lonely.*
• few = almost none, negative. *I have few friends here, so I feel lonely.*

The same works for uncountable nouns:

• a little = some. *There's a little milk left — enough for coffee.*
• little = almost none. *There's little milk left — we need to buy more.*

In everyday speech, "few" and "little" alone sound formal. Most people say *not many* or *not much* instead: *I don't have many friends here.*

Rule 10: Why is "I don't have nothing" wrong?

Standard English uses one negative word per idea. Two negatives cancel each other out in formal grammar.

• ❌ *I don't have nothing.*
• ✅ *I don't have anything.* or ✅ *I have nothing.*
• ❌ *She never tells nobody.*
• ✅ *She never tells anybody.*

You will hear double negatives in songs, movies and some regional dialects. They are part of real speech, but avoid them in school, work emails and job interviews.

How do you actually remember these rules?

Reading rules once doesn't change how you speak. Practice does. Here's a simple plan that takes about 15 minutes a day:

1. Pick one rule per day. Don't try all ten at once.

2. Write five sentences about your own life using that rule. Real sentences stick better than textbook ones. *My sister works in a bakery. She doesn't work on Sundays.*

3. Say them out loud. Your mouth needs practice, not just your eyes.

4. Find the rule in the wild. Watch a short video or read a news article and spot two examples.

5. Review on day 11. Go back to Rule 1 and repeat the cycle. The second round goes much faster.

Which mistakes should you fix first?

If you're short on time, focus on the mistakes people notice most in conversation:

Don't worry about being perfect. Native speakers make small grammar mistakes all the time. The goal is to be clear and easy to understand.

Your next step

Today, take Rule 2 (the third-person -s). Write five sentences about a friend or family member — what they do, what they like, what they don't like. Read each sentence and check: does every verb after he, she or a name end in -s or -es? Tomorrow, move to Rule 6 and write five questions you could ask a new coworker.

FAQ

What is the most common English grammar mistake?

Forgetting the -s on verbs after he, she, it or a single person, as in 'She work' instead of 'She works'. It shows up in almost every sentence about other people, so it is the first rule to fix.

When do I use 'a' and when do I use 'an'?

It depends on the sound, not the letter. Use 'an' before a vowel sound (an hour, an apple) and 'a' before a consonant sound (a university, a car).

What is the difference between 'few' and 'a few'?

'A few' means some or enough and feels positive. 'Few' means almost none and feels negative. 'I have a few friends' is good news; 'I have few friends' is not.