10A Go Beyond page 65 couldn't have, may/might could have, must

Perfect modals: could have, couldn't have, may have, might have, must have + ________

• past participle

• verb-ing

• past simple

Throw -> threw -> (a)   (past participle)

Use could have, couldn't have, may have, might have, must have + past participle to talk about possible explanations for things in the ______ that are based on evidence.

• past

• present

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

• must have

• might have

• couldn't have

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

• must have

• might have

• couldn't have

"He may have gotten some bad news".

How sure is the person saying this?

• 99% sure

• 62%

• 1%

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

• must have

• might have

• couldn't have

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

How sure is the person saying this?

• 99-100%

• 1%

• 74%

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

• might have

• must 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