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@Yui

7. People said that Thomas Edison invented the electric light bulb.

⇒  It was said that Thomas Edison invented the electric light bulb.

Cấu trúc: It (be) + P.P (Past participle của V1) + That + Part 2

8. The doctor ordered him to take a long rest.

⇒ He is ordered to take a long rest by the doctor.

9. A group of students has met their friends at the railway station.

⇒ A group of students' friends has been met at the railway station.

10. They didn’t allow Tom to take these books home.

⇒ Tom wasn't allowed to take these books home.

11. The teacher won’t correct the exercises tomorrow.

⇒ Exercises won't be corrected by the teacher tomorrow.

12. Mary has operated on Tom since 10 o’clock.

⇒Tom has been operated on since 10 o'clock by Marry.