MODALS EXPRESSING 'POTERE'

She looks very tired. She ______ working late. might have been. can't have been. mustn't have been. couldn't have been.

He's not answering his phone. He ______ be in a meeting. might. must. can't. may not.

That car is too expensive. I ______ afford it. might not. can't. couldn't. must not.

Did they win the lottery? That ______ be true! I didn't see any announcement. must. might. can't. could.

She said she would call, but I'm sure she ______. might not have called. can't have called. may not have called. mustn't have called.

He's been studying all day. He ______ be really exhausted. might. could. must. can't.

I heard a strange noise in the cellar. It ______ have been the cat, but I don't know exactly. must. can't. might. couldn't.

The keys are not on the table. Someone ______ them. I’m sure I left them there five minutes ago. must have taken. might have taken. can't have taken. couldn't have taken.

I'm not sure where he is, but I think he ______ be at the library. can't. must. might. couldn't.

He was late for work yesterday. He ______ missed the bus. can't have. must have. couldn't have. might have.