Chuyển sang câu bị động

18. Quang usually does his homework at night.
19. I don't like people laughing me at my mistake.
20. Did anyone see you come in?
21. I want you to leave me alone.
22. Who wrote this book?
23. She likes me to write that report
24. The cook ought to have prepared it. 25. Someone saw him pick up the gun.
26 Nobody used this motor for a long time.
27. People speak English all over the world.