3 Complete the sentences with the correct form of have to / don't have to or must/mustn't.

a Sophie has to get up early tomorrow. She's catching a train at 6 am.
b Jerry doesn't have to go to Mary's party, but he can go if he wants to.
c You mustn't smoke in the school. It's against the rules.
d William has to work harder if he wants to pass his exams.
e 'Do I have to show my passport at the airport?' 'Yes, you do.'
f You must be 16 before you can get married.