13. If Hoa had been here, she would talk to you

   Cấu trúc: Câu đk số 2:If + S + V2/ Ved, S +would/ Could/ Should…+ V

14. If you don't be good, you will be punished

   Cấu trúc Câu đk số 1: If + S + V(s,es), S + Will/Can/shall…… + V

15. It took me 2 days to write the report 

   Cấu trúc: It (take) + (time) + to + (verb)

16. We haven't gone out with him for 2 month

    Cấu trúc: Thì hiện tại hoàn thành: S + have/ has + VpII

17. If she had enough money, she could buy that book

   Cấu trúc: Câu đk số 2:If + S + V2/ Ved, S +would/ Could/ Should…+ V

18. Unlessit rain, we will go to the cinema this evening 

  Cấu trúc: Unless + S + V (simple present), S + will/can/shall + V (Unless=If not)

20.  If Carol had not been studying, she would have answered the phone

  Cấu trúc: Câu đk số 2: If + S + V2/ Ved, S +would/ Could/ Should…+ V