1. This flower is watered by my father every morning
2. Fiona was invited to his birthday party by John last night
3. The dinner is being prepared in the kitchen by her mother
4. Our teeth should be cleaned twice a day by us
5. The english grammar has been explained by our teachers
6. The accident was caused by some drunk drivers in this city
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 made by Mary?
10. These old pictures won't be hung in the living room by me

1.My father waters this flower every morning.

=> this flower is watered by my father every morning

2.John invited Fiona to his birthday party last night.

=> Fiona was invited to John's birthday party last night

3.Her mother is preparing the dinner in the kitchen.

=> The dinner is being prepared in the kitchen by her mother

4.We should clean our teeth twice a day.

=>Our teeth should be cleaned twice a day

5.Our teachers have explained the English grammar.

The english grammar has been explained by our teachers

6.Some drunk drivers caused the accident in this city.

=> The accident was caused by some drunk drivers in this city

7.Tom will visit his parents next month.

=> Tom's parents will be visited next month

8.The manager didn’t phone the secretary this morning.

=> the secretary wasn't phoned by the manager this morning

9.Did Mary make this beautiful dress?

Was this beautiful dress made by Mary?

10.I won’t hang these old pictures in the living room.

=> These old pictures won't be hung in the living room