37. He hasn't been back to his hometown for over 20 years now.

→ It is over 20 years since he last went back to his hometown.

38. My sister regrets not buying that book.

→ My sister wishes she bought that book.

39. Having nowhere else to go, I tried to sleep in the station waiting room.

→ As I had nowhere else to go, I tried to sleep in the station waiting room.

40. The book was interesting to most children.

→Most children are interested in the book.

1. He hasn't been back to his hometown for over 20 years now. → It is over 20 years since he was last back to his hometown.

2. My sister regrets not buying that book. → My sister wishes she had bought that book.

3. Having nowhere else to go, I tried to sleep in the station waiting room. → As I had nowhere else to go, I tried to sleep in the station waiting room.

4. The book was interesting to most children. → Most children found the book interesting.

37. It's over 20 years since he last went back to his hometown . 

38.My sister wishes she had bought that book .

39. As I had nowhere else to go, I tried to sleep in the station waiting room

40.Most children are interested in the book.

chúc bạn học tốt !!!

37.It is over 20 years now since he last visited his hometown
38.As I had nowhere else to go, I tried to sleep in the station waiting room
39.Most children found the book interesting.