Modal Auxiliaries: Complete Guide for Class 10 English Grammar | Rules, Uses & Examples

- August 13, 2026

Modal Auxiliaries

Complete Guide for Standard 10 English Grammar

Meaning • Uses • Rules • Examples • Practice

🌟 What are Modal Auxiliaries?

Modal auxiliaries are special helping verbs used with a main verb to express meanings such as ability, permission, possibility, probability, advice, necessity, obligation, request, willingness, duty, courage and past habits.

Modal auxiliaries are very important in Standard 10 English Grammar. Students should understand both the modal and the meaning expressed by it.

📚 Common Modal Auxiliaries

Can, Could, May, Might, Shall, Should, Will, Would, Must, Ought to, Need, Dare, Used to

Have to is also commonly studied along with modal auxiliaries because it expresses necessity and obligation.

• She can swim.

• You should study regularly.

• It may rain today.

• We must obey the rules.

• I will help you.

• You have to complete your homework.

⭐ Basic Rule of Modal Auxiliaries

A modal auxiliary is generally followed by the base form (V1) of the main verb.

Subject + Modal + V1 + Object

✅ She can sing.

✅ He may come tomorrow.

✅ We should study hard.

✅ They must follow the rules.

❌ She can sings.

❌ He may comes.

❌ We should studies.

1. CAN

Can is used mainly to express ability, permission, possibility and request.

A. Can – Ability

It shows that a person is able to do something.

I can solve this problem.
She can speak English.
He can swim very well.
They can play cricket.
We can complete this work.

B. Can – Permission

Can I use your pen?
Can I come in?
Can we go home now?

C. Can – Possibility

Too much rain can cause floods.
Mistakes can happen.
This road can be dangerous at night.

D. Can – Request

Can you help me?
Can you open the door?

Negative: cannot / can't
I cannot solve this problem.

2. COULD

Could is used for past ability, polite requests and possibility.

A. Could – Past Ability

I could swim when I was six.
She could sing very well when she was young.
He could run very fast in his childhood.

B. Could – Polite Request

Could you help me?
Could you explain this question?
Could you please open the window?

C. Could – Possibility

It could rain tonight.
He could come tomorrow.
This could be the correct answer.

Negative: could not / couldn't

I couldn't understand the question.

3. MAY

May is used mainly for permission, possibility and wishes/blessings.

A. May – Permission

May I come in?
May I use your notebook?
May I leave now?

B. May – Possibility

It may rain today.
She may come tomorrow.
He may win the competition.

C. May – Wish or Blessing

May God bless you!
May you succeed in your examination!
May all your dreams come true!

Negative: may not

He may not come today.

Important:
"He may not come" = perhaps he will not come.

"You may not enter" = you are not permitted to enter.

4. MIGHT

Might is mainly used to express possibility or uncertainty.

It might rain tonight.
She might come tomorrow.
He might be at home.
We might win the match.
They might visit us next week.

May and Might:

It may rain. → There is a possibility.

It might rain. → There is a possibility, but it sounds more uncertain.

5. SHALL

Shall is traditionally used with I and we. It can express future, suggestion, offer and determination.

A. Future

I shall return soon.
We shall meet tomorrow.

B. Suggestion

Shall we start the lesson?
Shall we go to the library?

C. Offer

Shall I help you?
Shall I open the window?

D. Determination

We shall overcome all difficulties.
We shall succeed.

6. SHOULD

Should is used for advice, duty, expectation and probability.

A. Advice

You should study regularly.
You should respect your parents.
You should eat healthy food.

B. Duty

Students should obey their teachers.
We should follow the rules.

C. Expectation

The train should arrive soon.
He should be here by now.

Negative: should not / shouldn't

You should not waste your time.

7. WILL

Will expresses future, willingness, promise, determination and prediction.

I will go to school tomorrow.
She will visit Mumbai next week.
I will help you.
I will never tell a lie.
We will succeed.

Negative: will not / won't

I will not give up.

8. WOULD

Would is used for polite requests, preferences, past habits and imaginary situations.

A. Polite Request

Would you help me?
Would you open the door, please?

B. Preference

I would like some tea.
She would like to join us.

C. Past Habit

When I was young, I would play cricket every evening.
My grandfather would tell us interesting stories.

D. Imaginary Situation

I would help you if I had enough time.
She would buy a car if she had enough money.

9. MUST

Must expresses necessity, strong obligation, compulsion and strong certainty.

A. Necessity

We must study for the examination.
You must wear a seat belt.
Students must complete their homework.

B. Obligation

We must obey the law.
You must follow the rules.

C. Strong Certainty

He must be tired after such a long journey.
She must be at home now.

Negative: must not / mustn't

You must not smoke.
Students must not use mobile phones during the examination.

10. OUGHT TO

Ought to expresses duty, moral responsibility, advice and what is considered right.

We ought to respect our parents.
We ought to help the needy.
You ought to obey your teachers.
We ought to keep our surroundings clean.
You ought to work hard.

Negative: ought not to

You ought not to waste your time.

11. NEED

Need can express necessity, especially in negative sentences and questions.

You need not worry.
You need not come tomorrow.
You need not bring your books.

Need not = It is not necessary.

You need not bring your umbrella.

→ It is not necessary to bring your umbrella.

Questions

Need I come tomorrow?
Need we wait here?

12. DARE

Dare expresses courage or lack of courage to do something.

He dare not speak against his teacher.
She dare not ask him a question.
They dare not enter the room.

Meaning: "He dare not speak" means that he does not have the courage to speak.

Question: Dare he challenge the teacher?

13. USED TO

Used to expresses a past habit or past situation that is no longer true.

A. Past Habit

I used to play cricket.
She used to walk to school.
We used to visit our grandparents every Sunday.

B. Past Situation

He used to live in Mumbai.
There used to be a garden here.

Negative

I did not use to play cricket.
She didn't use to live here.

14. HAVE TO

Have to is commonly used to express necessity, obligation or compulsion. It is similar in meaning to must.

A. Have to – Necessity

I have to study for my examination.
We have to complete our homework.
They have to wear school uniforms.

B. Has to

With he, she, it and singular nouns, use has to.

He has to work hard.
She has to attend the meeting.
Riya has to complete her project.

C. Had to – Past Necessity

I had to study late last night.
She had to leave early.
We had to wait for the bus.

D. Negative

I don't have to go today.
She doesn't have to come tomorrow.

Don't have to = It is not necessary.

🚨 MUSTN'T vs DON'T HAVE TO

This is a very important distinction for examinations.

MUSTN'T = NOT ALLOWED

You mustn't use a mobile phone during the examination.

→ You are not allowed to use it.

DON'T HAVE TO = NOT NECESSARY

You don't have to bring your textbook tomorrow.

→ It is not necessary to bring it.

📚 Modal Auxiliary – Quick Revision Chart

Modal	Main Use	Example
Can	Ability / Permission	I can swim.
Could	Past ability / Polite request / Possibility	Could you help me?
May	Permission / Possibility / Wish	May I come in?
Might	Possibility	It might rain.
Shall	Suggestion / Offer	Shall we go?