Modal verbs speculation and deduction

The passengers .......... scared!

• must have been

• must has been

• might have was

• couldn't have be

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

She ...... a lot to get there! You need to work hard to be successful.

• couldn't have struggle

• must have struggled

• must has struggled

• should have struggle

Kennedy's family must ..... a lot of pain.

• have suffered

• has suffered

• have suffer

• suffered

Nixon might have ...... under a lot of pressure!

• be

• were

• been

• to be

Of course John isn't here today. He spent the whole night dancing. He ___ be at home with a serious foot ache.

• can't

• must

• may

• should

You ___ possibly be tired. You've just woken up.

• can't

• could

• must

• should

Your mother ___ be a great cook. You are always so keen to get back home to eat!

• can't

• might

• must

• can

I don't know why I am so tired these days. I ___ be working too hard. Or maybe I am not sleeping too well.

• can't

• might

• must

• should