Exercise 1: Put the correct form of the verb in passive voice:
1. This flower (water) _____ by my sister every morning
2. Jonh (invite) ______ by Flora to her birthday party last night
3. Dinner (prepare) _______ by her mother in the kitchen at the moment
4. Our teeth (should clean) ___________ twice a day
5. The English grammar (already/explain) ___________ by our teachers
6. The accident (cause) _______ by some drunk drivers in this city yesterday
7. Stella (visit) ______ by her parents next month
1 is watered
2 was invited
3 is being prepared
4 should be cleaned
5 has already been explained
6 was caused
7 will be visited
1 is watered
2 was invited
3 is being prepared
4 should be cleaned
5 has already been explained
6 was caused
7 will be visited