Exercise 8:Complete the sentences with don’t/doesn’t have to or must not

1. Liz finally got a car. So now she usually drives to work. She _______ take the bus.

2. Tommy, you ________ say that word. That’s not a nice word.

3. Mr. Moneybags is very rich. He _______ work for a living.

4. If you are in a canoe, you _______stand up and walk around. If you do the canoe will probably tip over.

5. A: You _______ tell Jim about the surprise birthday party. Do you promise?

B: I promise.

6. A: Did Professor Adams make an assignment?

B: Yes, he assigned Chapters 4 and 6 but we _______ read Chapter 5.

7. A: I ______ to set my alarm for 5:30.

B: Why do you have to get up at 5:30?

A: I’m going to meet Ron at 6:00. We’re going fishing.

8. A: Listen to me carefully, Annie. If a stranger offers you a ride you _______ get in the car. Never get in the car with a stranger. Do you understand?

B: Yes, Mom.

9. A: Do you have a stamp?

B: Uh-huh. Here.

A: Thanks. Now I ______ go to the post office.

10. A: Children, your mother and I are going to go out this evening. I want you to be good and follow these rules: You must do everything the baby-sitter tells you to do. You __________ go outside after dark. It’s Saturday night so you ______ go to bed at eight. You can stay up until eight-thirty. And remember: you _______ pull the cat’s tail. Okay?

B: Okay, Dad.

4-6 MAKING SUGGESTIONS: USING LET’S AND WHY NOT

a) A: It’s hot today. Let’s goto the beach. B: Okay. Good idea. b) A: It’s not hot today. Why don’t we go to the beach? B: Okay. Good idea.	Let’s(do something) and why don’t we (do something) have the same meaning. They are used to make suggestions about activities for you and me.
c)A: I’m tired. B: Why don’t you takea nap? A: That’s a good idea. I think I will.	People use why don’t you(do something) to make a friendly suggestion, to give friendly advice.