`2,` It's over 20 years since he last saw her.

- Cấu trúc: S + have/has not + V3/ed + O + for + khoãng thời gian

 `=` It's + khoãng thời gian + since + S + (last) + V2/ed + O

- Dịch: Anh ấy lần cuối gặp cô ấy hơn 20 năm trước.

`3,` We haven't visited Hue before.

- Cấu trúc: S + have/has not + V3/ed + before `=` This is the first time + S + have/has + V3/ed + O

- Dịch: Chúng tôi chưa từng tới Huế trước đây

`4,` She began learning EL 2 years ago.

- Cấu trúc:

 S + have/has + V3/ed + O + for + khoãng thời gian `=` S + began + Ving + khoãng thời gian + ago

2. he hasn't seen her for over 20 years
$\Longrightarrow$ it's 20 since he last saw her.
GT:
+) S + has/have + not + VPII + for + Khoảng thời gian.
= It is + khoảng thời gian + since + S + last + Ved.
3, this is the first time we visited hue
$\Longrightarrow$ we haven't visited Hue before.
GT:
+) It/This + is + the + first + time + S + have/has (ever) + VPII
= S + have + not/never + VPII ... + before
4, she has learned EL for 2 year
$\Longrightarrow$ she began learning/to learn English 2 years ago.
GT: 
+) S + have/has + VPII + for/since ...
= S + started/began + to - V/Ving + ago(nếu có for)/in/on/at/When(nếu có since).
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