1) I can't leave without playing. It's against my principles.2)You must do as you are told.3)You can't have seen Peter in the library yesterday.4)I can find my spectacles. I must have left them at home.5)She never spoke of her childhood, and there must have been some reason for it.6)The may have been at the party but i didn't see them.7)Someone is knocking at the door. It may be Kate.8)You haven't eaten anything today, you must be starving.9)Excuse me, could you tell me the way to the nearest bank?10)You might have given them a call to say you were not coming.