Underline the correct form. Example: You must / don’t have to tidy your room. It’s a mess. 1 You don’t have to / mustn’t

1) You must tidy your room. It’s a mess. 2) You mustn’t swim there. It’s dangerous. 3) I don’t have to do my homework. It’s Saturday. 4) She must practise the piano tonight. She’s not very good. 5) They don’t have to be home early. They’re very young. 6) We don’t have to buy tickets — entrance is free. 7) You can’t go to the party. It’s too late.