Bạn ơi làm giúp mình từ câu 12->30 nhé tại vì mai cô mình kiểm tra cảm ơn các bạn

`Đáp` `án:`

12. Is this the first time you have played a computer game? 

13. I haven't spoken to her for three years.

14. I haven't spoken to him for two years. 

15. We have lived here for 20 years. 

16. It's the first time I have ever eaten this kind of cake. 

17. I haven't seen her since 2005.

18. I haven't played tennis since 1990.

19. I haven't seen her since 2005.

20. Can't you offer a better price?

21. I haven't seen him since I was a student.

22. It's over 20 years since he last came back to his village.

23. It's the first time we have met such a famous singer.

24. She has worked as a secretary for five years.

25. When did you last use the pen?

26. I haven't seen him for one year.

27. I haven't spoken to her for three years.

28. They haven't visited me for 5 years.

29. They started to study computer two years ago.

30. We haven't met each other for ten years.

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Các công thức đổi HTHT - QKĐ

Loại 1: 

S + has/have + not + V3/ed + for/since + time 

--> S + last + V2/ed 

--> The last time + S+ V2/ed + was + time + ago

--> It is / has been + time + since + S+ (last) + V2/ed 

Loại 2: 

How long + has/have + S+ V3/ed?

--> When + did + S + V1?

--> How long is it + since + S+ V2/ed ?

--> How long ago + did + S + start / begin + to V / Ving? 

Loại 3:

S + has/have + V3/ed + for/since + time 

--> S + started / began + to V / Ving 

--> It is / has been + time + since + S+ V2/ed 

Loại 4: 

S + has/have + not/never + V3/ed + ... before

--> This/It is the first time + S+ has/have+ V3/ed

Loại 5:

When + did + S + last + V1?

--> When + was the last time + S + V2/ed?