—Must I learn all these words by heart?
—No, you ______. It’ll be fine if you copy them in your exercise books.

—I think the man over there must be Bob.
-- It_______ be him. He has______ to Australia. 

---Would you come to my birthday party tomorrow evening?
---I’m afraid I ______. I have to look after my sister.

-　Look,　Sue　is　over　there.
-　That　____　be　her.　She　is　in　Canada　now.

-- May I go out now. Dad?
-- No. You __    let your mother know first.

--- Can you ride a horse?
　 --- No, I ______.

–Mr. Wang, can I finish my homework tomorrow?   --Sorry, you ________.

— _______ we clean the classroom at once?  
— No, you _______. You _______ clean it after school.

—Whose T-shirt is this??
—It   be John’s. It’s      small for him.?

—Could I finish it today or tomorrow ?
—Either day is OK．Take your time．You _________ do it as you like．