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.