8.2 Modal verbs: have to/don't have to, mustn't 1 Choose the correct option in the sentences. 0 In class, you have to mustn't listen to the teacher. 1 In school, you have to / mustn't be on time for lessons. 2 When you play sport, you have to/mustn't wear the wrong clothes. 3 At break times, you have to / don't have to go outside if the weather is good. 4 If the Head Teacher comes into your class, you don't have to / mustn't stand up. 5 In the school library, you have to / mustn't work very quietly. 6 At lunchtime, you have to / don't have to / mustn't eat in the school cafeteria - you can also eat outside. 7 In science experiments, you have to / don't have to / mustn't do silly things with the chemicals and equipment.​