SYM4 Unit 7 Grammar 1 Past Modals of Deduction

A: Look at her diamond ring. B: Yes, it __ cost a fortune.

• couldn't have

• must have

• might have

• may have

A: Patrick isn't answering his phone. B: He __ switched it off or left it at home.

• might have

• must have

• could have

• couldn't have

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

• must have

• might have

• couldn't have

• could have

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

• must have

• might have

• couldn't have

• may have

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

• must have

• might have

• couldn't have

• mustn't have

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

• must have

• might have

• might not have

• couldn't have

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

• must have

• may have

• might have

• couldn't have

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

• must have

• may have

• might 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

• could have

• couldn't have

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

• must have

• could have

• might have

• couldn't have