EXAMPLES	EXPLANATIONS
(a) I finished all of my homework this afternoon. I don't have to study tonight.	Don't OR doesn’t have to expresses the idea that something is not necessary.
(c) Children, you must not play with matches. (d) We must not use that door. The sign says PRIVATE - DO NOT ENTER. (e) You mustn't play with matches.	Must not expresses prohibition (DO NOT DO THIS) Must + not = mustn't.

Directions: Complete the sentences with don't or doesn't have to or must not.

1. You drive when you are tired. It's dangerous.

2. I live only a few blocks from my office. I drive to work.

3. Liz finally got a car, so now she usually drives to work. She take the bus.

4. Tommy, you say that word. It's not a nice word.

5. Mr. Moneybags is very rich. He work for a living.

6. A: You tell Jim about the surprise birthday party. Promise?
    B: I promise.

7. According to the rules of the game, one player hit or trip another player.

8. If you use a toll-free number, you pay for the phone call.

9. A: Did Professor Adams make an assignment?
    B: Yes, she assigned Chapters 4 and 6, but we read Chapter 5.

10. A: Listen carefully, Annie. If a stranger offers you a ride, you get in the car. Do you understand?
     B: Yes, Mom.

11. A: Do you have a stamp?
     B: Uh-huh. Here.
     A: Thanks. Now I go to the post office to buy stamps.

12. Children, your mother and I are going out. I want you to be good. 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?

AZAR 3rd. EXERCISE 26. Lack of necessity (NOT HAVE TO) and prohibition (MUST NOT).