Напишите следующие предложения в вопросительной и отрицательной формах:1. He knows French

Напишите последующие предложения в вопросительной и отрицательной формах:
1. He knows French perfectly.
2. I understand everything he says.
3. They stayed in Moscow all summer.
4. She planned her work well.
5. They will return in October.
6. These exercises will be easy for you.
7. The door of the office was open.
8. The wind last night was very strong.
9. We were pleased to receive your letter.
10. The door of the office was open.