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28.1 Put in must or can’t.

  1. You’ve been travelling all day. You must be tired.
  2. That restaurant must be very good. It’s always full of people.
  3. That restaurant can’t be very good. It’s always empty.
  4. I’m sure I gave you the key. You must have it. Have you looked in your bag?
  5. I often see that woman walking along this street. She must live near here.
  6. It rained every day during their holiday, so they can’t have had a very nice time.
  7. Congratulations on passing your exam. You must be very pleased.
  8. You got here very quickly. You must have walked very fast.
  9. Bill and Sue always stay at luxury hotels, so they can’t be short of money.

28.2 Complete each sentence with a verb (one or two words).

  1. I’ve lost one of my gloves. I must have dropped it somewhere.
  2. Their house is very near the motorway. It must be very noisy.
  3. Sarah knows a lot about films. She must go to the cinema a lot.
  4. I left my bike outside the house last night and now it’s gone. Somebody must have stolen it.
  5. ‘How old is Ted?’ “He’s older than me. He must be at least 40.
  6. I didn’t hear the phone ring. I must have been asleep.
  7. A: You’re going on holiday soon. You must be looking forward to it. B: Yes, it will be really good to get away.
  8. The police have closed the road, so we have to go a different way. There must have been an accident.
  9. I’m sure you know this song. You must have heard it before.
  10. There is a man walking behind us. He has been walking behind us for the last 20 minutes. He must be pursuing us.

28.3 Read the situations and use the words in brackets to write sentences with must have and can’t have.

  1. We went to their house and rang the doorbell, but nobody answered. (they / go out) They must have gone out.
  2. Sarah hasn’t contacted me. (she / get / my message) She can’t have got my message.
  3. The jacket you bought is very good quality. (it / very expensive) It must have been very expensive.
  4. I haven’t seen our neighbours for ages. (they / go away) They must have gone away.
  5. I can’t find my umbrella. (I / leave / it in the restaurant last night) I must have left it in the restaurant last night.
  6. Amy was in a very difficult situation when she lost her job. (it / ey for her) It can’t have been easy for her.
  7. There was a man standing outside the cafe. (he / wait / for someboyd) He must have been waiting for somebody.
  8. Rachel did the opposite of what I asked her to do. (she / understand / what I said) He can’t have understood what I said.
  9. When I got back to my car, the door unloked. (I / forget / to look it) I must have forgotten to lock it.
  10. I was woken up in the night by the noise next door. (my neighbours / have / a party) The neighbours must have been having a party.
  11. The light was red, but the car didn’t stop. (the driver / see / the red light) The driver can’t have seen the red light.

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