Modal Verbs.

Must

Neccesity

"Have to"

Example

We must go now

You muastn't tell lies

Could

Past ability

Examples

Could he swin when hes was five years old?

Yes, he could.

No, he couldn't

Could

Polite request

Exaples

Could you pass me the sugar?

Yes, of course

Shall

Suggestion

Examples

Shall we go now?

Yes, we shall

No, we shan't

Can

Examples

Can he swim?

Yes, he can

No, he can't

Present ability

Would

Polite Request

Examples.

Would you hold this for me?

Yes, of course

Express

Ability

Neccesity

Permission

Needn't

Need not

Examples

We have milk. You needn't buy any

May

Polite request

Examples

May i used the barthroom?

Yes, you may

Yes, you may not