Essential English Grammar Rules

Articles

Master the use of A, AN, and THE in English.

🔸 1. A / AN (Indefinite Articles)

👉 Used when we talk about something general or for the first time.

✔️ A

Used before words that start with a consonant sound.

a book, a car, a dog

✔️ AN

Used before words that start with a vowel sound.

an apple, an hour (silent 'h')

📌 Examples:

I have a dog.

She bought an umbrella.

🔸 2. THE (Definite Article)

👉 Used when something is specific or already known to the listener.

📌 Examples:

I saw a dog. The dog was big.

Close the door.

🔸 When we also use THE:

✔️ Unique things

the sun, the moon

✔️ Geography

the USA, the Alps

✔️ Superlatives

the best, the biggest

🔸 3. No Article (Zero Article)

👉 Used when speaking in general about plural nouns or uncountable things.

📌 Examples:

I like music.

Dogs are friendly.

She goes to school.

🔥 Quick Summary

a / an → something general

the → something specific

no article → general ideas or plural/uncountable nouns

Plural Nouns

Plural nouns are used when we talk about more than one thing.

🔸 1. Regular Plurals (add -s)

👉 Most nouns just add -s.

📌 Examples:

book → books
car → cars
dog → dogs

🔸 2. Nouns ending in -s, -sh, -ch, -x, -z

👉 Add -es to make pronunciation easier.

📌 Examples:

bus → buses
box → boxes
watch → watches
dish → dishes

🔸 3. Nouns ending in -y

✔️ Consonant + Y

Change -y to -ies.

baby → babies
city → cities

✔️ Vowel + Y

Just add -s.

boy → boys
toy → toys

🔸 4. Nouns ending in -f / -fe

👉 Often change to -ves.

📌 Examples:

leaf → leaves
wife → wives
knife → knives

⚠️ Exceptions:

roof → roofs
chief → chiefs

🔸 5. Irregular Plurals (must memorize)

👉 These don’t follow rules.

📌 Examples:

man → men
woman → women
child → children

tooth → teeth
foot → feet
mouse → mice

🔸 6. Same in singular & plural

📌 Examples:

sheep → sheep
fish → fish
deer → deer

🔥 Quick Summary

add -s → most words

add -es → after s, sh, ch, x, z

-y → -ies (if consonant before)

-f → -ves (sometimes)

irregular → learn by heart

Prepositions: in, on, at

These prepositions are used for time and place, and they can be confusing — but there’s a simple logic 👇

🔸 1. IN

👉 Used for longer periods of time and inside spaces.

⏰ Time:

in the morning
in 2025
in July
in winter

📍 Place (inside something):

in a room
in a car
in a city

📌 Examples:

I was born in 2008.
She is in the room.

🔸 2. ON

👉 Used for days / dates and surfaces.

⏰ Time:

on Monday
on my birthday
on July 5th

📍 Place (on a surface):

on the table
on the wall
on the floor

📌 Examples:

I have a test on Monday.
The phone is on the table.

🔸 3. AT

👉 Used for exact times and specific places.

⏰ Time:

at 5 PM
at noon
at midnight

📍 Place (point/location):

at school
at home
at the bus stop

⚠️ Common Mistakes:

~~in Monday~~ → on Monday
~~at July~~ → in July
~~on 5 PM~~ → at 5 PM

📌 Examples:

I wake up at 7 AM.
She is at the station.

🔥 Quick Comparison

Preposition	Time	Place
in	months, years	inside something
on	days, dates	on a surface
at	exact time	specific point

Modal Verbs

Modal verbs are special verbs used to express ability, possibility, permission, obligation, advice, etc.

🔸 Common Modal Verbs

can could may might must have to should will / would

🔸 1. CAN / COULD

👉 Ability / possibility / permission

📌 Examples:

I can swim. (ability)
Can I go out? (permission)
It could rain. (possibility)

🔸 2. MAY / MIGHT

👉 Possibility (more formal / less certain)

📌 Examples:

It may rain.
She might come later.

🔸 3. MUST / HAVE TO

👉 Obligation / necessity

📌 Examples:

You must study. (strong / personal)
I have to wake up early. (rule / situation)

🔸 4. SHOULD

👉 Advice / recommendation

📌 Examples:

You should sleep more.
He should apologize.

🔸 5. WILL / WOULD

👉 Future / polite requests / conditionals

📌 Examples:

I will call you.
Would you help me?
I would go if I had time.

🔥 Important Rules

✔️ 1. No “to” after modal verbs

                                    ✅ I can swim 
                                    ❌ I can to swim
                                

✔️ 2. Base form of verb

                                    ✅ She can go 
                                    ❌ She can goes
                                

✔️ 3. No -s in 3rd person

                                    ✅ He can swim 
                                    ❌ He cans swim
                                

🔥 Quick Summary

can → ability

could/might/may → possibility

must / have to → obligation

should → advice

will / would → future / polite

Passive Voice

The passive voice is used when the action is more important than the person who does it, or the doer is unknown.

🔸 Structure

👉 be (in correct tense) + past participle (V3)

📌 Examples:

Active: She writes a letter
Passive: A letter is written (by her)

🔸 When to use Passive Voice

✔️ 1. Doer is unknown

My phone was stolen

✔️ 2. Doer is not important

The road is being repaired

✔️ 3. Formal / scientific style

The experiment was conducted

🔸 Passive in Different Tenses

Present Simple

Active: They make cars
Passive: Cars are made

Past Simple

Active: They built a house
Passive: A house was built

Future Simple

Active: They will finish the work
Passive: The work will be finished

Present Continuous

Active: They are building a bridge
Passive: A bridge is being built

Present Perfect

Active: They have cleaned the room
Passive: The room has been cleaned

🔸 By + Doer

👉 Use by if we want to say who did the action.

📌 Examples:

The book was written by him
The song was sung by her

🔥

🔥 Important Rules

✔️ 1. Object becomes subject

                                    Active: She eats an apple → Passive: An apple is eaten 
                                

✔️ 2. Use V3 (past participle)

                                    write → written   |   eat → eaten
                                

✔️ 3. Not always needed

👉 Sometimes passive sounds unnatural in casual speech.

🔥 Quick Summary

Passive = be + V3 → Focus on action, not the doer

Usage → Often used in formal English / when doer is unknown

Conditionals

Conditionals are sentences used to talk about situations and their results.

🔸 0 Conditional (Zero)

👉 Used for facts and general truths.

                            🧩 If + present simple → present simple
                        

📌 Examples:

If you heat water, it boils.
If I eat too much, I feel sick.

🔸 1st Conditional

👉 Used for real and possible future situations.

                            🧩 If + present simple → will + verb
                        

📌 Examples:

If it rains, I will stay home.
If you study, you will pass.

🔸 2nd Conditional

👉 Used for unreal / imaginary situations (present or future).

                            🧩 If + past simple → would + verb
                        

📌 Examples:

If I had money, I would travel.
If I were you, I would study more.

🔸 3rd Conditional

👉 Used for past situations that didn’t happen (regret).

                            🧩 If + past perfect → would have + V3
                        

📌 Examples:

If I had studied, I would have passed.
If she had left earlier, she would have arrived on time.

🔥 Mixed Conditionals (optional, B2+)

👉 Mix past and present.

📌 Example:

If I had studied, I would have a better job now.

🔥

🔥 Important Rules

✔️ 1. Comma rule

                                    If it rains, I will stay home. 
                                    I will stay home if it rains. (no comma) 
                                

✔️ 2. “Were” instead of “was”

                                    ✅ If I were you (correct)
                                

✔️ 3. Don’t use “will” after IF

                                    ✅ If it rains 
                                    ❌ If it will rain
                                

🔥 Quick Summary

0 → facts

1st → real future

2nd → unreal now

3rd → unreal past