To provide further practice of mustn't and don't have to for second grade.

"Mustn't" and "don't have to" grammar exercise for 2nd. Grade A,B and C:

Complete the sentences with mustn't or don't have to. Check your grammar rules.

1. It is forbidden. You mustn't 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.
11. He's a millionaire. He ______ work but he does because he enjoys it.
12. I like Saturdays because I ______ go to work.
13. This is very important. You ______ forget what I said.
14. It's very infomal here. You ______ wear a tie unless you want to.
15. The train is direct. You ______ change trains.
16. In boxing, you ______ hit your opponent below the belt.
17. I ______ wear a suit at work on Fridays. We can wear casual clothes.
18. In athletics, you ______ start before the gun is fired.
19. In bridge, you ______ look at other people's cards.
20.You ______ be mad to work here but it helps.