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

If you ________ smoke in the room, please keep the windows open.

—Must I return the book to you now, Jack? —No, you _____. You can give me back tomorrow.

The new supermarket announced that the first to purchase goods on the opening day_______ get a big prize.

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