1. I have known her for six years.
=> She has been known for six years.

2. She bought some comic books for her brother.
=> Some comic books were bought for her brother.
3. There aren't any rivers in my hometown.
=> I wish there were some rivers in my hometown.

4. Do you speak others languages?
=> She asked me if I speaked others language
5. These flowers are beautiful.
=> Miss Nga said that these flowers were beautiful.
6. I must come to the meeting tomorrow.
=> He said that he must have come to the metting the following day
7. I can't visit you because i am busy.
=> If I were not busy, I could visit you
8. I live here with my parents.
=> Nam said that he lived there with his parents.
9. People must build a school in this area.
=> A school must be built in that area.

1. I have known her for six years.
-?she has been known for six years by me.
2. She bought some comic books for her brother.
-?some comic books were bought for her brother by her.
3. There aren't any rivers in my hometown.
-?i wish there were some rivers in my hometown.
4. Do you speak others languages@
-? She asked me if I spoke others languages.
5. These flowers are beautiful.
-?miss Nga said that these flowers were beautiful.
6. I must come to the meeting tomorrow.
-?he said that he had to come the meeting the next day.
7. I can't visit you because i am busy.
-? If I weren't busy, I could visit you.
8. I live here with my parents.
-? Nam said that he lived there with his parents.
9. People must build a school area.
-? a school must be built area.

không hiểu chỗ nào em có thể hỏi nha, chị sẵn sàng giúp đỡ, không phải ngại đâuu nha.