BÀI TẬP 1: Chuyển câu chủ động sang câu bị động 1. John invited Fiona to his birthday party last night. 2. We should clean our teeth twice a day. 3. Our teachers have explained the English grammar. 4. Some drunk drivers caused the accident in this city. 5. Tom will visit his parents next month. 6. The manager didn’t phone the secretary this morning. 7. Did Mary buy this beautiful dress? 8. I won’t hang these old pictures in the living room. 9. The German didn’t build this factory during the Second World War. 10. The Greens are going to paint this house and these cars for Christmas Day.