16. He knocked down the woman (có thể thay he bằng chủ ngữ khác)
17. I will be picked up at my house
18. When was he seen in that bank ?
19. The keys were returned to me by a man
20. Her friends will be seen off at the station by Mary
21. That building has to be pulled down
22. Đúng
23. Beer used to be drunl in England
24. 3 shirts can be sewn a day
25. Đúng
26. This room hasn't been used for ages
27. An article is being translated in Vietnamese
Các đại từ he, she, it, they, we ko cần ghi lại là by + O