Modals

Can't act alone

Must go with a main verb

Modals have more tan one meaning

Ability

We can swim.

Asking for permission

Can we stay here?

Request

Can you give me some information?

Inability/impossibility

We can't do it.

Could

Asking for Permission

Could I borrow your dictionary?

Request

Could you speak slowly?

Suggest

We could do it ourselves.

Ability in the past

He gave up his old job so he could work for us.

May

Ask for Permission

May I go out?

Future possibility

Malaysia may achieve its vision 2020.

Might

Present Possibility

They might be at the library now.

Future possibility

They might visit us next week.

Must

Necessity / Obligation / Rules

We must wear uniform.

We must take care of our parents.

Prohibition

They must not cross the busy highway.

Will

Instant decision

I will do it now.

Offer

I will do it for you if you like.

Promise

I will bring the book tomorrow.

Certain Prediction

We will pass the exam.

Would

Asking for Permission

Would you mind if I borrow your pen?

Request

Would you pass the sugar please?

Making arrangement

Would three o'clock suit you?

Invitation

Would you like to join our party this Friday?

Preference

Would you prefer tea or coffee?

Should

Recommending Actions

We should check the weather forecast before taking off.

Giving Advice

You should study hard if you want to pass the exam.