Поставьте предложения в отрицательную и вопросительную форму.
1. We have done business with this firm. 2. She has been to the theatre this week. 3. They have come back today. 4. She has phoned you this morning.5. They have had a good time. 6. The film has been on since last week. 7. I have known him for ten years. 8. They have lived in Moscow for a long time. 9. We have received two letters from him since he went to London.