.......... leaving the room, I had turned off the lights

Before I left the room, I turned off the lights

I had turned off the lights, I left the room 

mấy câu này làm gì sai b

1. The film was so boring that she decided to go home early.

2. It is such a difficult question that all the students can't answer it.

3. Mr. Brown wants to use solar energy but he does not have enough money to buy necessary equipment.

4. By the time Shakespeare died in 1616, he had written more than 37 plays.

5. Since Douglas fell off his bicycle last week, he has had to use crutches to walk.

6. I (had) turned off the lights before I left the room.

7. As soon as the other passengers get on the bus soon, we'll leave.

8. Whenever Susan feels nervous, she chews her nails.

9. The frying pan caught on fire while I was making dinner.

10. I wont return my book to the library until I have finished my research project.

1. The film was so boring that she decided to go home early

2. It is  such a difficult question that all the students can't answer

3. Mr. Brown wants to use solar energy but he does not have enough money to buy necessary equipment.

4. By the time Shakespeare died in 1616, he had written more than 37 plays.

5. Since Douglas fell off his bicycle last week,  he has to use crutches to walk

6.  Before I left the room, I had turned off the lights.

7. As soon as the other passengers get on the bus, we will leave

8. Whenever Susan feels nervous, she chew her nails

9. While I was making dinner at that time, the frying pan caught on fire

10. I won't return my book to the library until I finish my research project.

1. The film was so boring that she decided to go home early.

2. It is such a difficult question that all the students can't answer it.

3. Mr. Brown wants to use solar energy but he does not have enough money to buy necessary equipment.

4. By the time Shakespeare died in 1616, he had written more than 37 plays.

5. Since Douglas fell off his bicycle last week, he has had to use crutches to walk.

6. I (had) turned off the lights before I left the room.

7. As soon as the other passengers get on the bus soon, we'll leave.

8. Whenever Susan feels nervous, she chews her nails.

9. The frying pan caught on fire while I was making dinner.

10. I wont return my book to the library until I have finished my research project.

Đáp án D

Before + Ving chỉ khi 2 mệnh đề cùng chủ ngữ, chủ ngữ của mệnh đề chính là “all the lights”

Đáp án: D

Giải thích: mệnh đề trạng ngữ chỉ mục đích so as (not) to V

Dịch: Anh ta tắt đèn trước khi ra ngoài để tránh tốn điện.

KEY: D

Giải thích: mệnh đề trạng ngữ chỉ mục đích so as (not) to V

Dịch: Anh ta tắt đèn trước khi ra ngoài để tránh tốn điện.

Mình đang phân vân là

The lights were turned off when I went out

The lights was turned off when I went out

Someone turned off the lights when I went out

-> The lights were turned off when I went out.