---- Are your parents ______ you?---- Sometimes they are. For example, I have to be back home before 7 o’clock every evening.
---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.
After a long walk, the old man be tired now.