1. Circle the correct option in these true sentences: Cars must / don’t have to stop when the traffic lights are red; 1) Students in the UK mustn’t / don’t have to go to school on Saturdays; 2) People have to / don’t have to be quiet in the library; 3) In the UK, drivers must / mustn’t drive on the left, not the right; 4) You mustn’t / don’t have to eat crisps in class; 5) A person has to / doesn’t have to study for years to become a doctor; 6) Teachers must / mustn’t mark their students’ homework.

1. Cars must stop when the traffic lights are red.
2. Students in the UK don’t have to go to school on Saturdays.
3. People have to be quiet in the library.
4. In the UK, drivers must drive on the left, not the right.
5. You mustn’t eat crisps in class.
6. A person has to study for years to become a doctor.
7. Teachers must mark their students’ homework.

Перевод: должны; не обязаны; должны; должны; нельзя; должен; должны.