Chuyển câu chủ động thành câu bị động
câu bị động:
1. My father waters this flower every morning. 2. John inveted Fiona last night. 3. Her mother is preparing the dinner in the kitchen. 4. We should clean our teeth twice a day. 5. Our teachers have explained the English grammar. 6. drivers caused the accident in this city. 7. Tom will visit his parents next month. 8. The manager didn't phone the secretary this morning. 9. Did Mary buy this beautiful dress ? 10. I won’t hang these old pictures in the living room. 11. The German didn't build this factory during the Seecond World War. 12. The Greens are going to paint this house and these cars for Christmas Day. 13. Ann had fed the cats before she went to the cinema. 14. The students have discussed the pollution problems since last week. 15. Have the thieves stolen the most valuable painting in the national museum ?