1. These flowers were bought by my father this morning.
2. Fiona was invited to John's birthday party last night.
3. The dinner is being prepared by her mother in the kitchen.
4. Our teeth should be cleaned twice a day.
5. The English grammar has been explained by our teachers.
6. The board is cleaned by students every morning.
7. Tom's parents will be visited by him next month.
8. The secretary wasn't phoned by the manager this morning.
9. Was this beautiful dress bought by Mary?
10. These old pictures won't be hung in the living room.
11. Their homework haven't been finished yet.
12. A new house will be built by the Greens next year.
13. Dishes are washed by Ann after meals.
14. The pollution problems have been discussed by the students since last week.
15. Has the most valuable painting in the national museum been stolen by the thieves?
16. The new president will be interviewed by some people on TV. ("on" mới đúng nhé)