$\textit{Answer:}$

31. It is two months since I saw him.

$\rightarrow$ I haven't seen him for two months.

- Giải thích: Hành động bắt đầu trong quá khứ kéo dài tới hiện tại và có thể cả tương lai $\Rightarrow$ Thì HTHT $\Rightarrow$ Have/has (not) Vp2 for + khoảng thời gian/since + mốc thời gian...

32. I haven't seen her since she left for hanoi.

$\rightarrow$  I last saw her when she left for hanoi.

- Giải thích: S + last+ ved/2 +.....+when...+ ago $\Rrightarrow$ S+ v3/ed+...........+ since...+ for.....

33. How long have you learned English ?

$\rightarrow$ When did you learn English?

- Giải thích: How long + have/has + S + Ved/3? = When + did + S + V(be) + ...?

34. She started learning English three years ago.

$\rightarrow$ She has learing English for three years.

- Giải thích: S + V(Ed) + ... $\Rightarrow$ Have/has (not) Vp2 for + khoảng thời gian/since + mốc thời gian...

35. It started to snow at 5 o'clock.

$\rightarrow$ It has snowed since 5 o’clock.

- Giải thích: S + Ved/P2 + to_V + mốc t/gian ... = S + has/have + since + mốc t/gian...

36. Sue began to be interested in healthy eating 3 years ago.

$\rightarrow$ Sue has been interested in healthy for 3 years.

- Giải thích: Started/ Began + Ving/ to V = S + has/have + P $\Rightarrow$ + ..... + (for + khoảng thời gian/ since + mốc thời gian)

37. I last read a book on September 20.

$\rightarrow$ I haven't read a book when September 20.

- Giải thích: S + last+ ved/2 +.....+when...+ ago $\Rrightarrow$ S+ v3/ed+...........+ since...+ for.....

38. We have been here since last week.

$\rightarrow$ We came here last week.

39. It is one year since I last saw him.

$\rightarrow$ I haven't seen him for one year.

$\Rightarrow$ It is + thời gian + since + S + last + V2/ed = S + have/has + not + Vpp + for + khoảng thời gian.

$\textit{#minhthu5626}$

$\textit{#English}$