12 English Grammar Rules That Fix Most Beginner Mistakes

Priya Sharma

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

Visual representation of the voice · not a photographic portrait

Quick answer: Most beginner English mistakes come from about 12 rules, such as adding -s after he/she/it, choosing a or an by sound, and the difference between few and a few. Learn one rule at a time, write 5 sentences about your life with it, and read them out loud until they feel easy.↗ Share on X

The fastest way to fix your English grammar is to stop trying to learn every rule at once. Most beginner mistakes come from about a dozen rules: verb endings, "a" versus "an," when to use "the," countable nouns, question word order, and small words like "few" and "a few." Learn one rule, write five sentences of your own with it, say them out loud, and move to the next rule only when those five sentences feel easy. The 12 rules below are in the order that helps most learners.

Why do beginners keep making the same mistakes?

READ ALSOPick the Right English Tense for Daily Life Easily →Past Simple or Present Perfect? A Simple Rule That Works →When To Say A, An Or The In English: The Simple Rules →

Your first language has its own grammar, and your brain uses it as a shortcut. If your language has no articles, you will forget "a" and "the." If your language does not change the verb for "he" or "she," you will write "he work" instead of "he works." This is normal. It does not mean you are bad at English.

The fix is not more theory. The fix is noticing one pattern, practicing it on purpose, and repeating it until your ear catches the mistake before you make it.

Rule 1: Add -s to the verb after he, she, and it

In the present simple, the verb changes only for he, she, it, or one person or thing.

• Wrong: She work in a hospital.
• Right: She works in a hospital.
• Wrong: My brother live in Texas.
• Right: My brother lives in Texas.

Verbs that end in -s, -sh, -ch, -x, or -o take -es: watches, fixes, goes. Verbs that end in a consonant plus -y change to -ies: "study" becomes "studies."

Rule 2: Choose "a" or "an" by sound, not by letter

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Use "an" before a vowel sound and "a" before a consonant sound. The letter does not decide. The sound does.

• an apple, an hour (the "h" is silent)
• a university (it starts with a "you" sound)
• a one-way ticket (it starts with a "w" sound)

Say the word out loud. If your mouth starts with a vowel sound, use "an."

Rule 3: Use "the" when the listener knows which one

Use "a" when you talk about one thing for the first time. Use "the" when you and the listener both know which thing you mean.

• I bought a car. The car is blue.
• Can you close the door? (There is only one door in the room.)

Do not use "the" for general ideas with plural nouns or with things you cannot count:

• Wrong: The dogs are loyal animals. (when you mean all dogs)
• Right: Dogs are loyal animals.
• Wrong: I like the music. (when you mean music in general)
• Right: I like music.

Rule 4: Know if a noun is countable

Countable nouns can have a number in front: one chair, two chairs. Uncountable nouns cannot: water, money, advice, information, furniture, homework.

A common trap: "advice," "information," and "homework" never take -s in English.

• Wrong: She gave me good advices.
• Right: She gave me good advice. / She gave me two pieces of advice.

Rule 5: "Few" and "a few" do not mean the same thing

The tiny word "a" changes the feeling of the whole sentence.

• a few = some, a small number, and that is enough. The feeling is positive.
• few = almost none, not enough. The feeling is negative.

Examples:

• I have a few friends in this city. (I am not alone.)
• I have few friends in this city. (I feel lonely.)

The same idea works for uncountable nouns with "little" and "a little":

• We have a little time. Let's get coffee.
• We have little time. We need to hurry.

A simple test: if you can add "so I am happy" at the end, use "a few" or "a little." If you can add "so there is a problem," use "few" or "little."

Rule 6: Use "do" or "does" to make simple questions

In the present simple, English builds questions with a helper verb. The main verb goes back to its basic form.

• Informal: You like coffee? (fine when speaking, but not correct in writing)
• Right: Do you like coffee?
• Wrong: Does she works here?
• Right: Does she work here?

Notice that when you use "does," the -s moves to "does." The main verb loses it.

With question words, the order is: question word + do/does + person + verb.

• Where do you live?
• What time does the store open?

Rule 7: Put adjectives before the noun

An adjective is a word that describes a noun, like "red," "big," or "good."

• Wrong: I have a car red.
• Right: I have a red car.

Adjectives do not take -s in English, even when the noun is plural:

• Wrong: They are goods students.
• Right: They are good students.

Rule 8: Use the past simple for finished time

If you say when something happened (yesterday, last week, in 2019, two days ago), use the past simple, not the present perfect.

• Wrong: I have seen him yesterday.
• Right: I saw him yesterday.

Use the present perfect (have + past participle) when the time is not finished or not important:

• I have visited Canada three times. (in my life, up to now)

Also remember: after "did," the verb goes back to the basic form.

• Wrong: Did you went to work?
• Right: Did you go to work?

Rule 9: Don't use "more" with short adjectives

For short adjectives with one syllable, add -er. For long adjectives, usually with three syllables or more, use "more."

• Wrong: This box is more big.
• Right: This box is bigger.
• Right: This question is more difficult.

Never use both at the same time:

• Wrong: She is more taller than me.
• Right: She is taller than me.

Two-syllable adjectives that end in -y change to -ier: "easy" becomes "easier," "happy" becomes "happier."

Rule 10: Use only one negative word

Many languages use two negatives for emphasis. Standard English uses just one.

• Wrong: I don't know nothing.
• Right: I don't know anything. / I know nothing.
• Wrong: We didn't see nobody.
• Right: We didn't see anybody.

After "don't," "didn't," or "never," use "any" words: anything, anyone, anywhere.

Rule 11: Use "in," "on," and "at" for time

Think from big to small.

• Wrong: See you in Monday.
• Right: See you on Monday.

Rule 12: Its vs. it's, your vs. you're

These mistakes are common even for native speakers, and people notice them in emails and job applications.

• it's = it is or it has. It's cold today.
• its = belongs to it. The dog hurt its leg.
• you're = you are. You're late.
• your = belongs to you. Is this your phone?

Test: replace the word with "it is" or "you are." If the sentence still makes sense, use the short form with the apostrophe.

How can you practice in 15 minutes a day?

Reading rules is not the same as using them. Here is a simple routine you can repeat every day:

1. Pick one rule from the list above. Only one.

2. Write 5 sentences about your own life with that rule. Use real sentences, like "My sister works at a bank."

3. Read them out loud twice. Your ear learns patterns, not only your eyes.

4. Find the rule in real English. Watch a short video or read a news article and look for 3 examples of the rule.

5. Keep a mistake notebook. Write the wrong sentence and the right sentence side by side. Read the notebook once a week.

6. Move on after 3 days if the sentences feel easy. If they still feel hard, stay on the same rule.

With this routine, you can cover all 12 rules in about five or six weeks, and then start again as a review.

Which grammar topics can wait?

Some topics sound important but can wait until the basics feel natural: every small difference between "will" and "going to," advanced "if" sentences, reported speech, and the passive voice in long sentences. People will still understand you if these are not perfect. They will notice "he don't" or "an university" much faster.

Also, do not stop speaking because you are afraid of mistakes. A sentence with one small error that you say out loud teaches you more than a perfect sentence that stays in your head.

What should you do next?

Take a piece of paper right now and complete this sentence three times, filling the blanks in a different way each time: "My friend lives in ___ and has a few ___." Then choose Rule 1 or Rule 5, write your five sentences, and read them out loud before you close this page. Tomorrow, do the same with the next rule. Fifteen minutes every day will take you further than three hours once a week.

FAQ

What is the difference between few and a few?

A few means a small number that is enough, so the feeling is positive: I have a few friends here. Few means almost none, so the feeling is negative: I have few friends here.

Which English grammar rule should I learn first?

Start with adding -s to the verb after he, she, and it in the present simple. It appears in almost every conversation, and people notice the mistake quickly.

How long does it take to learn basic English grammar rules?

If you practice one rule for about three days with 15 minutes a day, you can cover these 12 rules in five or six weeks. Some people need more time, and that is normal.