1. A long letter was written by you yesterday.
2. Credit cards are used to make shopping easier.
3. French isn't taught by her in all schools.
4. Lunch is served by them at 12:00.
5. The animals are fed by her twice a day.
6. The advertisement wasn't seen by us.
7. The best computers are made in England.
8. Pets aren't kept at home by them.
9. A magazine wasn't bought by me last weekend.
10. Strawberries are grown by them every year.
11. The washing up is done by Mona in the evening.
12. Two sausages were eaten by the cat.
13. Paris is visited by me every summer.
14. Three cups of tea were drunk by Tim.
15. That film is known by us very well.