Modals - deductions about the past:1

Why were there no buses yesterday? Maybe it was the snow or they ____ been on strike.

• must have

• might have

• could't have

You ____seen her, surely! She was standing right in front of you.

• must have

• might have

• can't have

Let's ask the reception to see if they have your keys. Someone ____ found them.

• must have

• might have

• can't have

He _____ gone to Rusia. He didn't have a passport.

• must have

• might have

• couldn't have

I explained the homework but she did the wrong page. She _____ misunderstand me.

• must have

• may have

• can't have

Oh no! My phone's not in my bag. I _____ left it at home.

• must have

• can have

• couldn't have

It is still a mystery how the robber gained access to the bank. Police are investigating whether the suspect _____ known one of the employees.

• must have

• may have

• couldn't have

I _____ left my wallet inthe restaurant. I paid for the taxi home afterwards.

• must have

• could have

• can't have