Exercise 5 : Read the situations and use the words in brackets to write sentences with must have and can't have.
3. The jacket you bought is very good quality, it must have been very expensive.
4. I haven't seen the people the next door for ages, they must have gone away.
5. I can't find my umbrella, it must have left in the restaurant last night.
6. Don passed the exam without studying for it, my exam was very difficult.
7. She knew everything about our plans, she must have listened to our conversation.
8. Fiona did the opposite of what I asked her to do. She couldn't understood what I said.
9. When I woke up this morning, the light was on. I must have forgotten to turn it off last night.
10. The lights were red but the car didn't stop, the driver must haven't seen the red light.
11. I was woken up in the middle of the night by the noise next door, the neighbours must have had a party.