Mustn't or don't have to? Underline the correct verb form. 1) You mustn't/don't have to tell Tom what I told you. It's a secret. 2) The museum is free. You mustn't/don't have to pay to get in. 3) Children mustn't/don't have to ...

Mustn't or don't have to? Underline the correct verb form. 1) You mustn't/don't have to tell Tom what I told you. It's a secret. 2) The museum is free. You mustn't/don't have to pay to get in. 3) Children mustn't/don't have to tell lies. 4) You mustn't/don't have to play with matches. They're dangerous. 5) This is my favorite pen. You can borrow it, but you mustn't/don't have to lose it.