1) Everyone in the class ...... incredibly hard during the year if all passed the final exam with flying colours. 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 woke up in the night screaming. 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) could stop b) could 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 football. 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) might 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) He looked so unfocused when we spoke to him during the call, he ...... worried about something. a) may be b) may have been 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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