1.This flower is watered by my father every morning.

2.Fiona was invented to John’s birthday party last month.

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 teacher.
6.The accident was caused in this city by some drunk drivers.
7.Tom’s parents will be visited by him next month.
 

1. This flower is watered (by my father) every morning.
2. Fiona was invented to John’s birthday party last month.
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 teacher).
6. The accident was caused in this city (by some drunk drivers).