Grammar
Don’t have to = Do not have to
We use don’t have to to say that there is no obligation or necessity to do something. For example: “You don’t have to do the exercises at the end of this page.” Mustn’t = must not We use mustn’t to show that something is not allowed. When you use mustn’t you are telling people not to do something. It has the same force as don’t, as in: Don’t do that! For example: “You mustn’t drink if you’re going to drive. ? Writing Exercise 1. Put mustn’t, don’thave to or doesn’t haveto. 1. It is forbidden. You ______ do that. 2. You ______ ask my permission. You can do what you want. 3. You ______ speak to the driver when the bus is moving. It's dangerous. 4. Help yourself to anything you want. You ______ ask. 5. You ______ park here. There is a double yellow line. 6. Pay me back when you can. You ______ do it immediately. 7. It's optional. We ______ to go if you don't want to. 8. I'll tell you a secret. You ______ tell anybody else. Promise? 9. Whatever you do, you ______ click with the right mouse button or the program will crash. 10. Be on time. You ______ be late or we will leave without you.
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