Modal verbs or modal auxiliary verbs are a type of verbs that indicates modality, i.e., likelihood, permission, ability and obligation. Some of the common modal verbs are can, could, may, might and must.

Types Of Modals

1. Will

Will is used to show a wish, prediction, request, demand, order, assumption, promise, etc.

Examples:

Will you please keep quiet?

Aruna says, it will rain today.

Kumar said he will not drink alcohol henceforth.

Whereas, would is used to show a wish or to request in a polite way and sometimes to express habits.

Examples:

Would you please give me 100 bucks?

She would remain very calm during her examination days.

2. Can

Can is used to show permission, possibility, and ability.

Examples:

You can join us for the dinner if you want.

Can I leave early today?

Sanvika can speak English fluently.

3. Could

Could is used to represent a suggestion, request, permission, future possibility and ability in the past.

Examples:

Could I go for a movie?

I think we could do it.

Neha gave up her dreams so that she could marry him.

4. May

May is used to ask permission and to show future possibility.

Examples:

May I have a cup of tea?

India may become a developed country by 2020.

5. Might

Might is used to show present and future possibility.

Examples:

I have a coupon of Pantaloons, that might offer a discount of 10% after showing them.

Mrs. Smith might be sleeping now, let’s not disturb her.

6. Must

Must shows the necessity, obligation and prohibition.

Examples:

You must not do it.

We must leave now.

7. Should

Should is used to show advice and obligation.

Examples:

You should walk carefully as the roads are slippery.

Shriya, you should close the tap and avoid wastage of water.

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Hope it help:)