11. My father waters this flower every morning
-> ..............................This flower is watered by my father every morning ..................................
12. John invited Fiona to his birthday party last night.
-> ..........................Fiona was invited to his birthday party by John last night.......................................
13. Her mother is preparing the dinner in the kitchen.
-> .........................The dinner is being prepared by her mother in the kitchen........................................
14. We should clean our teeth twice a day.
-> ........................Our teeth should be cleaned twice a day by us ................................
15. Our teachers have explained the English gramar.
-> .......................The English grammar have been explained by our teachers.......................................
16. Some drunk drivers caused the accident in this city.
-> ..........................The accident was caused by some drunk drivers in thí city.................................................
17. Tom will visit his parents next month.
-> ..........................His parents will be visited by Tom next month..................................
P/s: 3 câu cuối chưa học nên ko biết làm, sorry ạ
18. The manager didn't phone the secretary this morning.
-> ............................................................................
19. Did Mary wear this beautiful dress last night?
-> ......................................................................
20. I won't hang these old pictures in the loving room.
-> ..................................................................................