Material unit 2

may, might, could, must,can’t

Use

We use may, might and could when we think something is possible in the present or future.

Certain diets may prevent cancer.

We use must when we think something is certain in the present or future.

He must be very ill. He’s been off work all week.

We use can’t when we think something is impossible in the present or future.

You can’t be hungry. You’ve just eaten a

huge pizza.

We use may have, might have, could have, must have and can’t have + past participle to make deductions about the past.

I’m not sure, but I think Jamie may have gone home.

Form

must/can’t/might/may/could + infinitive

They might go to France for their holidays, but they haven’t decided yet.

may have, might have, could have, must haveand can’t have + past participle

Jenny isn’t in her room. She must have gone out.