Bài 3: Chuyển các câu sau sang câu bị động (Câu hỏi) 1. Did your friend buy his car two years ago? 2. Did the man see the thieves? 3. Did the soldier obey the order? 4. Did the dustbin men collect the rubbish? 5. Did your sister invite themto the party? 6. Did the athlete break the world record? 7. Did you tell them? 8. Did he send the letter? 9. Where did you buy this laptop? 10. Who cooked the meal? 11. When did the police arrest the burglar? 12. Who broke the vase? 13. What did he bring to the party? 14. How did you convince him? 15. Why did the headmaster punish him? 16. Who took the children to the zoo?