Ответ:
4. She is on a diet. She can't eat chocolate. *
5. You shouldn't wake up early on Sundays. There aren't any lectures. *
6. I had to clean all the flat yesterday. Today our guests will arrive. *
7. He must phone them tomorrow. It's very important. *
8. You needn't turn left there. There isn't left turning. *
9. It's 7 o'clock. She must go to work. *
10. Her brother needs help. She can help him. *
Объяснение: