Chuyển sang câu bị động:
1. Who are they keeping in the kitchen?
2. I know that they had told him of the meeting.
3. They will not ask him.
4. They said that I am a teacher.
5. People said that Nam killed his wife.
6. Does he often help you?
7. What is she doing?
8. People thought that she is a robber.
9. My father often buys me present on my birthday.
Help me!!! @Dương Yến Tử, @Tử Đằng, @Nguyễn Thị Nguyệt, ...