1. This flower is watered by my father every morning
2. Fiona was invited to John's birthday party last night
3. The dinner is being prepared in the kitchen by her mother
4. Our teeth should be cleaned twice a day
5. The English grammar has been explained by our teachers
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. This factory wasn't built by the German during the Second World War
10. This house and these cars are going to be painted for Christmas Day by the Greens
11. The pollution problems have been discussed by the students since last week
12. I was given a book by him yesterday
