Các công thức đổi HTHT - QKĐ

Structure 1: 

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

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

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

Structure 2: 

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

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

------------------------------------------------------------------

1. My sister has learned for 2 years.

2. I haven't had such a delicious glass of water before.

3. This is the first time I have ever eaten this kind of food.

4. Cuong has never gone to China before.

5. My parents have drunk since it started to rain.

6. I have never seen him before.

`color{orange}{~MiaMB~}`

`1` My sister has learned for 2 years

`2` I haven't had such a delicious glass of water

`3` This is the first time I have eaten this kind of food

`3` Cuong has never gone to China before

`4` My parents have drunk since it started to rain

`5` I have never seen him before

------------------

`-` S `+` started/began `+` V-ing/to V + ago

`->` S + have/has + Ved/V3 + since/for + .... (bỏ start/begin)

`-` S + have/has + not/never + Ved/V3 + .... before

`->` It/This is the first time + S + has/have + Ved/V3 + .... (bỏ before)