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Modals of Possibility

might and may

indicate that something is possible in the future, although not certain

They might come later.

I may buy a car.

can

to make general statements about what is possible.

She can run very fast.

could.

a possibility in the past tense

They could call me.

can not or can't

If we want to say that something is impossible

We can't go to the party.

could not or couldn't.

if we want to say that something was not possible in the past

They tried, but they couldn't see the movie.

must

show that we are sure that something is true.

It is snowing. It must be freezing out side.

should

to suggest that something is going to happen in the future.

It is almost dinner time. They should arrive soon

By Ronin