Modals of Deduction

I'm sure he ate some chocolate.

• He must have eaten chocolate

• He can't have eaten chocolate

• He may have eaten chocolate

• He might have eaten chocolate

She _____ studied really hard. She passed all her exams with excellent grades.

• must have

• might have

• may not have

• can't have

You _____ seen Robert; he has gone to Thailand.

• could have

• can't have

• might have

• must have

Andrew ___ gone to the city centre. He said that he wanted to go shopping today, but I’m not sure.

• can't have

• could have

• have

• couldn't have

I don't know why there weren't any buses yesterday. They _________gone on strike but I'm not really sure.

• must have

• may have

• can't have

I'm sure Dan Cooper didn't survive.

• He might have survived

• He can have survived

• He can't have been survived.

• He mustn't have survived.

They _____________ got there already. They only left ten minutes ago.

• can't

• must

• must have

• can't have

I think the planes .... very low to avoid radar signals.

• must have fly

• might have flew

• may have flown

• can't has flown

The police couldn't ..... done more to uncover the mystery behind this tragedy.

• to have

• to had

• had

• have

I'm sure Dan Cooper jumped out of the plane.

• He must have jumped out of the plane.

• He can't have jumped out of the plane.

• He might have jumped out of the plane.

• He must have jump out f the plane.