—I can’t find my mobile phone anywhere. —You _____ have lost it while eating out.

--Why are your eyes so red? You _______ have slept well last night.---Yeah, I stayed up late writing a report.

 One of our rules is that every student ____ wear school uniform while at school.

You _________ be punished if you break the school rules. 

He bought some books in the bookstore and his father________ him a lot of money.