—I didn’t see her yesterday.—Of course, you _____, because she had gone to a trip.

His brother met him at the Great Theatre yesterday afternoon, so he ____ have attended your lecture. 

. The movie was totally a waste of time. I ______ just as well have stayed at home.

He___ have attended the meeting this morning. He has been staying at my home for a whole day.

My English teacher insisted that the exercises ____very difficult and that we ____them carefully.