Помогите, пожалуйста, выполнить задание. Преобразуйте пассивную конструкцию в активную.
1. Yesterday our flight was delayed because of fog. They delayed our flight because of fog yesterday.
2. Letters have been sent to all our clients. They have sent letters to all our clients.
3. These trees were planted here two centuries ago. Someone planted these trees here two centuries ago.
4. This sort of advertisement is seen everywhere.
5. Nothing can be done about this.
6. When I got on the bus, money was collected by the bus driver.
7. My car is fixed every evening.
8. Don’t enter! The dictation is being written now.
9. By the time the boss returned, the fax had been received by the manager.
10. This letter was being signed at 4 yesterday.
11. Most business is based on the idea you buy cheap and sell dear.