1) Robin looks tired today. He ___________(sleep) well last night.  (50% possible) a) must have slept b) might not have slept c) should not have slept 2) I don't know why he hasn't called me back. He ___________(forget) my number. (50% possible) a) wouldn't have forgotten b) may have forgot c) might have forgotten 3) Our son promised to clean his room, but it is still very messy. He ___________(clean) it. (impossible) a) might not have cleaned b) must have cleaned c) can't have cleaned 4) The twins have guilty expressions on their faces. They ___________(do) something naughty. (100% sure) a) must have done b) might have did c) couldn't 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). (100% sure) a) can't have forgotten. b) must have forgotten. c) might have forgot. 6) Oh no! Our car isn't in the driveway! Somebody ___________(steal) it. (100% sure) a) must have stolen  b) might have stole c) must be stealing 7) My white shirt now has green streaks in it. It ___________(wash) properly. (100% sure) a) might not have washed b) can't have washed c) must not have been washed 8) My plants are dead. I ___________(water) them more often. (50% possible) a) can't have watered b) must have watered c) might have watered 9) Betty said she was really hungry, but she barely ate. She ___________(like) the food much. (impossible) a) can't have liked  b) might not have liked c) must have liked 10) Someone was calling me on the phone. It ___________(be) my brother. He promised to call. (100% sure) a) must have been b) might have been c) can have been 11)  There were some really difficult questions. I'm not sure. I ___________(pass) the exam. (50% possible) a) might not have passed b) can't have passed c) must not have passed 12)  I'd better call Anne. She ___________ (read) my e-mail. (50% possible) a) can't have read b) might not have read c) must have read

Past Modals of Certainty

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