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.

8. → The secretary wasn’t phoned (by the manager) this morning.

9. → Was this beautiful dress bought by Mary?

10. I→ 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 invented to John’s birthday party last month.

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

→ The dinner is being prepared (by her mother) in the kitchen.

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 teacher).

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

→ The accident was caused in this city (by some drunk drivers).

7. Tom will visit his parents next month.

→ Tom’s parents will be visited (by him) next month.