English LearningUpdated 2026-09-247 min read

12 English Grammar Rules Beginners Get Wrong (and Fixes)

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

Visual representation of the voice · not a photographic portrait

Quick answer: A small set of rules covers most everyday English: subject-verb-object word order, the -s on verbs after he/she/it, do/does in questions, a/an/the, past tense, and in/on/at. Learn these first and people will understand you clearly.↗ Share on X

Before you start studying English grammar, you need to know one thing: a small set of rules covers most of what you will say and write every day. Learn word order (subject, verb, object), the simple present and simple past, "a" versus "the," subject-verb agreement, and basic prepositions of time and place. Master those, and most people will understand you clearly, even if your English is not perfect. The 12 rules below are the ones beginners get wrong most often, each with a clear example and a quick fix.

Rule 1: What is the basic English word order?

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Rule 2: Why does "he" need an "s" on the verb?

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

Subject	Verb
I / you / we / they	work
he / she / it	works
my brother	lives
the bus	leaves

Correct: *He works at a bank.*
Wrong: *He work at a bank.*

This is one of the most common mistakes, even among intermediate learners. Native speakers notice it right away.

Rule 3: When do you use "do" and "does" in questions?

Rule 4: "A," "an," or "the": which one?

These small words are called articles. They confuse many learners because some languages do not have them.

A before a consonant sound: *a book, a car, a university* (sounds like "you").
An before a vowel sound: *an apple, an hour* (the "h" is silent).
The for something specific that you and the listener both know: *the book on the table.*

Compare:

*I bought a car.* (any car, first time you mention it)
*The car is red.* (that specific car we already talked about)

Quick fix: First mention, use *a/an*. After that, use *the*.

Rule 5: How do you form the past tense?

For regular verbs, add -ed: *walk → walked, play → played, study → studied.*

But many common verbs are irregular. They change in their own way:

Present	Past
go	went
have	had
make	made
see	saw
buy	bought
take	took
come	came
eat	ate

There is no shortcut here. The good news is that a short list of irregular verbs shows up in most daily conversation. Learn a few each week and use them in your own sentences.

Common mistake: In questions and negatives, the past helper is *did*, and the main verb goes back to its base form.

*Did you go?* (not *Did you went?*)
*I didn't see it.* (not *I didn't saw it.*)

Rule 6: When do you use "in," "on," or "at"?

Prepositions of time and place are small but important. Use this simple guide:

Word	Time	Place
in	months, years, seasons: in May, in 2020, in summer	cities, countries, closed spaces: in London, in the box
on	days and dates: on Monday, on July 4th	surfaces, streets: on the table, on Main Street
at	exact times: at 7 p.m., at noon	specific points: at the door, at the bus stop

Memory trick: Think of a triangle. *In* is the biggest (years, countries). *On* is the middle (days, streets). *At* is the smallest and most exact (times, specific spots).

Rule 7: Why is "I am agree" wrong?

*Agree* is already a verb. You do not need *am* before it.

Correct: *I agree with you.*
Wrong: *I am agree with you.*

The same mistake happens with other verbs: *I am live in Texas* should be *I live in Texas*. Use *am/is/are* with adjectives (*I am tired*) or with *-ing* verbs (*I am working*), not with a plain action verb.

Rule 8: When do you use the "-ing" form?

Use am/is/are + verb-ing for actions happening right now or around now. This is called the present continuous.

*I am reading a book.* (right now)
*She is studying for an exam this week.* (around now)

Use the simple present for habits and facts:

*I read every night.* (habit)
*Water boils at 100 degrees Celsius.* (fact)

Common mistake: Some verbs describe states, not actions, and usually are not used in the -ing form: *know, want, like, need, believe.* Say *I know the answer*, not *I am knowing the answer*.

Rule 9: How do plural nouns work?

Most nouns add -s: *cat → cats, book → books.* Some add -es: *box → boxes, bus → buses.*

But some are irregular:

*child → children*
*person → people*
*man → men*
*woman → women*
*foot → feet*

And some nouns cannot be counted, so they have no plural: *information, advice, money, water, furniture.*

Correct: *I need some advice.*
Wrong: *I need some advices.*

Rule 10: Where do adjectives go?

In English, adjectives usually go before the noun.

Correct: *a red car, a big house, an interesting book*
Wrong: *a car red, a house big*

Adjectives also never take a plural -s:

Correct: *two big houses*
Wrong: *two bigs houses*

Rule 11: How do you avoid double negatives?

Standard English uses only one negative word in a sentence.

Correct: *I don't have any money.* or *I have no money.*
Wrong: *I don't have no money.*

You may hear double negatives in songs or casual speech, but in school, work, and writing, use just one.

Rule 12: "Much" or "many"?

Many for things you can count: *many books, many people.*
Much for things you cannot count: *much time, much water.*
A lot of works for both and sounds natural in conversation: *a lot of books, a lot of time.*

Quick fix: If you are not sure, use *a lot of* in positive sentences.

How should you practice these rules?

Reading rules is only the first step. Your brain learns grammar by using it. Try this simple routine:

1. Pick two rules per week. Do not try to learn all 12 at once.

2. Write five sentences about your own life using each rule. For example, for Rule 2: *My sister works at a hospital. My dog sleeps all day.*

3. Read them out loud. Hearing your own voice helps you remember.

4. Find the rule in real English. Watch a short video or read a short news story and underline examples of that rule.

5. Ask for correction. Share your sentences with a teacher, a language exchange partner, or a friend who speaks English well.

6. Review old rules. At the end of each week, write two sentences for every rule you have already studied.

Your next step

Take a piece of paper right now and write three sentences about your day using Rule 2 (the -s for he/she/it) and Rule 5 (past tense). For example: *Yesterday I went to the store. My friend works near my house.* Check each sentence against the tables above. Tomorrow, add two sentences using Rule 6 (*in, on, at*).

FAQ

What is the most common English grammar mistake?

Forgetting the -s on the verb after he, she, or it, as in 'He work' instead of 'He works.' It is common even among intermediate learners.

How do I know when to use a or the?

Use a or an the first time you mention something, or when it could be any one. Use the when you and the listener both know exactly which one you mean.

How many grammar rules should I study at once?

Two per week works well. Write five sentences about your own life for each rule, read them out loud, and review old rules at the end of the week.