1) Everyone in the class ...... very hard because they all got a 10 in the exam. a) must work b) must have worked 2) I think she .... a really happy person because she's always smiling and laughing. a) must be b) must have been 3) Jamie got up in the middle of the night . He ..... a bad dream. a) must have b) must have had 4) I don't know why Patsy hasn't arrived yet. She ..... on the way to do some shopping. a) may stop b) may have stopped 5) I don't know how old the teacher is, but he looks young, so he .....more than 30. a) can't be b) can't have been 6) They say it .... during the weekend, in which case we won't be able to play foorball. a) may rain b) may have rained 7) I can't find my keys. I suppose I .... them on the train but I don't know. a) may leave b) may have left 8) You .... tired!!! You've only been digging for a few minutes. Dig on!!! a) can't be b) can't have been 9) If you don't hurry up, we ...... by the time you arrive here. a) may leave b) may have left. 10) You....a ghost last night! They don't exist! a) can't see b) can't have seen

Modals of certainty and possibility - Present and Past

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