1.I have never seen him before

2.I have studied English for 3 years

3.I last saw him is when i was at school .

4.It has  rained for two days

5.She is the most beautiful girl I have ever met

6. it is the coldest winter we have ever had

 MK xin CTLHN + 5* ạ

1. I have never seen him before.

- Cấu trúc:

 This's/It's the first time+S+have/has+P2

`->` S+have/has+not/never+P2+(before)

2. I have studied English for 3 years.

- Cấu trúc:

S+started/began+V-ing+...+thời gian+ago.

`->` S+have/has+P2++...+for+khoảng thời gian/since+mốc thời gian.

3. I last saw him since I left school.

- Cấu trúc:

S+haven't/hasn't+P2+since+mốc thời gian/for+khoảng thời gian+...

`->` S+last+Ved/V2+...+when/since+mệnh đề

                                      khoảng thời gian+ago

                                      in+năm

4. It has rained for 2 days.

- Cấu trúc giống câu 2.

5. She is the most beautiful girl (that) I have ever seen.

- Cấu trúc:

S+have/has+not/never+Ved/P2+..

`->` S+am/is/are+ss nhất của adj+...S+have/has+ever+Ved/P2

6. It is the coldest winter we have ever had.

- Cấu trúc giống như câu 5.