Past Modals of Certainty

I can’t believe you met Steve Jobs in person. That _______ amazing!

• should have be

• must have been

• couldn't have seen

• might have feel

Do you think we _______ the economic crisis if we had taken greater precaution?

• should have avoiding

• might not have avoid

• could have avoided

• must have avoid

John _______ at the party last night. He’s not even in the country. He flew to Japan yesterday morning.

• couldn't have been

• may not have be

• might not have be

• shouldn't have been

The investigators have several ideas about what _______ caused the fire.

• should have

• might have

• would have

• wouldn't have

I’m not completely convinced of his innocence. I think he _______ been involved.

• must have

• should have

• might have

• must not have

You _______ it in front of the rest of the people. I would have talked to him in private about it.

• shouldn't have mentioned

• should have mention

• would have mentioned

• could have mention

They said they were going to pick us up at 7 p.m. I think they _______ somewhere else!

• must not have gone

• should have go

• may have

• would have went

Tim’s supposed to be here, but it looks like he _______ .

• may have forgotten

• would have forgot

• couldn't have forget

• shouldn't have forgotten

Nobody knows exactly why he died. But we think it ____________ been an accident.

• can have

• might have

• should have

• can

I can't believe Jim hasn't arrived yet. He _________  the correct train.

• couldn't have taken

• could have take

• must have took

• should have took