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

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

--- I promise her daughter ______ get a nice present on her birthday.---Will it be a big surprise to her?

—____________you swim?   —Yes，but I’m not a good swimmer.

Food safety is important. Rules____ to stop people from food pollution.