14. Hoa invited Nga to go out for dinner with them. (invite sb to do sth: mời ai làm gì)

15. I used to go fishing with my friends when I was a small boy. (used to + bare-inf: đã từng làm gì trong quá khứ và giờ không làm nữa)

16. It is two weeks since Peter last wrote to his parents.

Peter has not written to his parents for two weeks.

17. Unless she hurries, she will be late for school. (Unless = If not)

18. My car is going to be repaired tomorrow.

I am going to have my car repaired tomorrow.

19. They told me not to live in that area because it was very dangerous.

20. If Hoa didn't get up late, she wouldn't be late for school. (ĐK loại 2)

21. If you are patient, you will be successful. (ĐK loại 1)