1) Robin looks tired today. He .........(not sleep) well last night. a) can't have slept b) may not have slept c) must not have slept 2) I don't know why he hasn't called me back. He .....(forget) my number. a) can't have forgotten b) should have forgetten c) might have forgotten 3) Our son promised to clean his room, but it is still messy. He ___________(clean) it. a) might not have cleaned b) couldn't have cleaned c) must have cleaned 4) The twins have guilty expressions on their faces. They _____(do) something naughty. a) must have done b) might have done 5) My friend promised to pick me up at 7:00. It's now 7:25 and I don't see him. He ____(forget) a) might have forgotten. b) must have forgotten. c) might be forgetting. 6) Look! Our car isn't in the driveway! Somebody ____(steal) it. a) must have stolen  b) might have stolen c) must be stealing 7) My white shirt now has green streaks in it. I ______(wash) it properly. a) must to wash b) can't have washed c) must not have not washed 8) My plants are dead. I _______(give) them enough water. a) couldn't give b) must give  c) can't have given d) can't not have given 9) Betty said she was hungry, but she didn't eat very much after all. She _____(like) the food. a) couldn't have liked  b) might not have liked c) must have liked 10) Someone was ringing. It .......(be) my brother. He promised to call. a) must have been b) might have been 11)  I'm not sure. I.......(not pass) the exam a) may not have passed b) could not have passed 12)  I had better call Anne. She ......(read) my e-mail. a) can't have read b) may not have read

ACPB - AD04 - Unit7 - MODALS OF CERTAINTY AND POSSIBILITY PAST

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