Mustn't or don't have to? You . … pay John - he hasn't done any work >You . pay John - I've already paid him. 1 You … … stay up late tonight - you've got school tomorrow morning.…

Давайте внимательно разберем, когда использовать "mustn't" и "don't have to".

1. Mustn't указывает на запрет или что-то, что нельзя делать.
2. Don't have to означает, что что-то не обязательно делать, но нет и запрета.

Теперь посмотрим на ваши примеры и заполним пропуски:

1. You mustn't stay up late tonight - you've got school tomorrow morning.
2. You don't have to stay up late to wash the dishes - I'll wash them in the morning.
3. We mustn't leave the door open - the rain will come in.
4. We don't have to leave the door open - Peter has got a key.
5. You don't have to write to Deepak about this - I've already written to him.
6. You mustn't write to Deepak about this - if you do, he'll tell everybody.
7. You mustn't drive so fast - the police will stop you.
8. You don't have to drive so fast - we've got a lot of time.
9. I don't have to look in the cupboard again - I've looked in there twice.
10. You must look in the cupboard - Holly has put my birthday present in there.
11. You mustn't phone Maxine now - she's probably asleep.
12. You don't have to phone Maxine now - tomorrow will be fine.

Если у вас есть еще вопросы или нужны дополнительные пояснения, буду рад помочь!