2. The weather had to be cancelled because of the bad weather.

Have to be + Vpp (Dạng câu bị động)

4. The interviewer asked Jane the reason why she wanted that job.

9. Minh asked Tam what English course he was going to attend the following day.

tomorrow => the following day

12. The interviewer asked Nam where he was from.

13. We haven't met him for 2 years.

The last time S + V(ed) + was + 1 khoảng thời gian =  S + hasn't/haven't + Vpp + for + 1 khoảng thời gian.

14. I asked Mr. Robinson which company he was working then.

15. This letter should be sent before Sunday. 

Giải thích: Các câu  4,9,12,14 đều là dạng chuyển câu về câu gián tiếp cho câu hỏi Wh- (What, which,when,why)

S1 + asked +O + Wh-words + S2 + V (lùi một thì so với câu gốc).