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4. He didn't finish his work until the bell rang. -> Not until the bell rang did he finish his work.

(đảo ngữ với Not until: Not until + mệnh đề/ trạng ngữ chỉ thời gian + trợ động từ + S +V)

5. When he is asked about his past, he hates it. -> He hates being asked about his past.

(hate + V_ing, kết hợp cấu trúc bị động => hate + being + P2)

6. Without Tom's help, Bill couldn’t have finished the work.

-> If it hadn't been for Tom's help, Bill couldn’t have finished the work.

(If it hadn't been for + cụm danh từ, S + would/ could/ might + have + P2)

7. William said to Mary "Why don't you put your luggage under the seat?"

-> William suggested that Mary should put her luggage under the seat.

8. "It's time we went to bed" they said. -> They said it was time they had gone to bed.

9. The robbers made the bank manager hand over the money.

-> The bank manager was made to hand over the money.

10. She hasn't been to Ho Chi Minh City for three years.

-> The last time she went to Ho Chi Minh City was three years ago.

11. I cleaned the floor then I went to bed. -> After I had cleaned the floor, I went to bed.

12. "Don't forget to send your parents my regards", she said to me.

-> She told me to send my parents her regards. 

13. "Would you like to dance with me?" she said to John.

-> She invited John to dance with her.

4. Not until the bell rang did he finish his work.

5.He hates being asked about his past.

6. If it hadn't been for Tom's help, Bill couldn’t have finished the work.

7. William suggested that Mary should put her luggage under the seat.

8. They said it was time they had gone to bed

9. The bank manager was made to hand over the money.

10. The last time she went to Ho Chi Minh City was three years ago.

11. After I had cleaned the floor, I went to bed.

12. She told me to send my parents her regards. 

13. She invited John to dance with her.