Исправить предложения: 1. it's sunday — we mustn't go to school. 2. he did must pay a fine. 3. he's carrying a bag full of letters — he can be the postman. 4. who's that at the door? it mustn't be paula because she's at work. 5. he doesn't like confined spaces — he must to have claustrophobia. 6. he might arrives late.
2.He had to pay a fine.
3... - he must be a postman.
4. It can't be Paula because she is at work.
5. He must have claustrophobia (без to)
6. He might arrive late. (без arriveS)