---Is the girl in the red skirt your sister?---No. It _______ be her. She has flown to Australia.

 ----You needn’t take an umbrella. It isn’t going to rain.----Well, I don’t know. It_____do.

—Isn’t Ann’s husband over there? —No, it _____ be him — I’m sure he doesn’t wear glasses.

Days later, my brother called to say he was all right, but _______say where he was.

— What do you want to eat for lunch? I will prepare it earlier today. — You_____, mum. Let’s go out to have something different.