My son likes plalying football . He plays it every day.
--_________ 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.