Modals - Speculating about the Past

Modals - Speculating about the Past

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Modals - Speculating about the Past
Three exercises to practice modal verbs to speculate about the past. 1st exercise: could/can't. 2nd exercise must/can't and 3rd might/might not. To be honest I do not exactly remember but I think they might have been based/taken and slightly changed from Murphy's grammar book.