— Mum, would you please buy me an MP5 player? — If you can help do some housework the whole vacation, you ____ have one as a reward.     

— I can’t find my dictionary anywhere.— You _____ have lost it while studying in the library.

 If you had told me in advance, I ___ him at the airport. 

.---I didn't go to work yesterday because my car broke down. ---You ____ mine. I wasn't using it then.

Shall I tell him the change of the schedule right now?---- I am afraid you ________, in case he comes late for the meeting.