-It sounds interesting. Can I join you?
--_________ I come back before five o’clock?--No, you________. But you can’t be back later than seven o’clock.
---Must I tell Mike about it?---No, you _______. He’s already been told.
We brush our teeth twice a day.
My mother is ill. I ______ stay at home to take care of her.
—Is Mr. Smith over there?—It ________ be him. He has gone to Beijing on business.