—Is Jack on duty today?
—It_____ be him. It’s his turn tomorrow.

 —Shall I inform him of the change of the schedule right now?
—I am afraid you _______, in case he comes late for the meeting.

It is strange that the well-behaved gentleman _______ be so rude.

If you_______ smoke, please go outside.

— Mum, would you please buy me an ipad?
— If you can help do the dishes the whole vacation, you ______ have one as a reward.

—Is it necessary to look up every new word when I come across it in reading?
—No. You ________， because you are likely to guess the meaning from the context.

Must I wait till you come back?  No, you ______.

—Who______ it be that is knocking at the door?
—It ______ be Father, but I’m not sure.

—I saw Nancy on the way home yesterday.
—It          be her. She’s gone to the USA for further study.

No student       go out of school for snacks during the break without the teacher’s permission.