Помгите можылуйста изменить предложения в пассивный залог

1. Cars were repaired by him yesterday.

2. Flowers are being planted by my mother.

3. The project will be finished by them tomorrow.

4.A book must be read by him.

5. A book was being read by Ann.

6. Food is cooked by my mother every day.

7. This room has been used by us for 2 days.

8. This picture had been painted by an artist by 4 o'clock.