Exercise

1) We have a lot of work tomorrow. You  be late. [ mustn't ]
2) You  tell anyone what I just told you. It's a secret. [ mustn't ]
3) The museum is free. You  pay to get in. [ don't have to ]
4) Children  tell lies. It's very naughty. [ mustn't ]
5) John's a millionaire. He  go to work. [ doesn't have to ]
6) I  do my washing because my mother does it for me. [ don't have to ]
7) We  rush. We've got plenty of time. [ don't have to ]
8) You  smoke inside the school. [ mustn't ]
9) You can borrow my new dress, but you  get it dirty. [ mustn't ]
10) We  miss the train, because it's the last one tonight. [ mustn't ]