---Fifty dollars for such a T-shirt！You_____ be joking！--- I’m serious. It’s made of silk.

-Listen! Is Mary playing the piano in the room?  --No. It ________ be Mary. She has gone to Hong Kong.

——Who’s that man? Is he Mr. Brown?——That    be Mr. Brown. He never walks this way.

That notebook _____  John’s. It has his name on it. 

—What do you think we can do for our aged parents?—You ____ do anything except to be with them and be yourself.