Modal Perfect - Modal verbs 7

All modal perfect auxiliary verbs refer to the past.

FORM: Modal + Have (Infinitive) + Past Participle

1. must have done = we are almost sure something happened in the past

• Jane wasn't feeling well yesterday. She must have caught a cold.
• Bill didn't answer the phone when I called him. He must have fallen asleep.

2. can't have done = we are almost sure something did not happen in the past

• She can't have forgotten to send you an invitation. I gave her your address.
• They can't have gone to bed late. They were very tired.

3. may / might / could have done = it is possible that something happened in the past but we aren't sure.

• Laura hasn't arrived yet. She may/might/could have missed the bus.
• I didn't see Paul at work. He may/might/could have been ill.

4. could have done = we had the ability to do something in the past but did not do it.

• You could have told us about the new project!
• She could have called me when she arrived but she forgot.

5. should have / ought to have done = (a) it was the right thing to do but we didn't do it. (b) we expected something to happen but it didn't.

• You should have told him the truth.
• They ought to have received the cheque by now.

6. would have done = we wanted to do something but we didn't do it in the end.

• They would have emailed you but the Internet was down yesterday.
• I would have bought that DVD but I didn't have enough money.

7. needn't have done = it wasn't necessary to do something but we did it.

• You needn't have gone to the supermarket. I've already done the shopping.
• The weather was warm and sunny. I needn't have taken an umbrella.

Modal Perfect Quiz