43. He often visited me on Sundays when he studied in England.

⇒ He used to visit me on Sundays when he studied in England.

– used to + V-bare: đã từng.

44. She has driven for one month

⇒ She started driving one month ago.

45. I haven't cut my hair since I left her.

⇒ I last had my hair cut when I left her.

46. l haven't seen him for 8 day.

⇒ The last time I saw him was 8 days ago. (The last time S V2/ed was + time (trong quá khứ) )

47. She was reading a book and the man came in

⇒ The man came in while she was reading a book.

48. Tom came to visit me while I was watching TV after dinner.

⇒  When I was watching TV after dinner, Tom came to visit me.

49. How long have you seen that film?

⇒ When did you see that film?

50. We have gone out since it started raining 

⇒ We began going out when it started to rain.