Поставьте данные предложения в вопросительную И отрицательную формы.

1. He must be listening to him.
2. She is to arrive soon.
3. My sister can dance best of all.
4. They could see him.
5. Children were allowed to eat ice-cream.
6. She had to work late.
7. I have to make notes.
8. They should have bought food.
9. He will be able to find us.
10. You were to learn it by heart.