`6.` I have been in Thai Nguyen for `6` years .

`7.` He has taught English since he was seniour at colleage .

`8.` This is the first time I have tried this motorbike .

`9.` She is ( không phù hợp ).

`->` This is the first time he has watched a wonderful movie like this .

`10.` I have never learnt this interesting lesson before .

`12.` He has recreational centre when he was at age `15`.

`13.` This is the first time I have come to Hai Phong .

`14.` This is the first time my student done this like coming too lately .

`@`$\text{Kiến thức :}$

`-` $\text{ S + last + Ved / V2 + time + ago / in + mốc thời gian / when + clause}$

`=` $\text{S + have / has + not + Ved / V3 + for / since}$

`=` $\text{It's + time + since + S + last + Ved / V2}$

`=`$\text{The last time + S + Ved / V2 + was + time + ago}$

`-` $\text{This is the first time + S + have / has + Ved / V3}$

`=` $\text{ S + have / has + never + Ved / V3 + before}$

`-` $\text{S + started / began + V-ing / to V + time + ago / in + mốc thời gian / when + clause}$

`=` $\text{S + have / has + Ved / V3 + for / since}$

`6.` I have been in Thai Nguyen for 6 years.

- S + started/begun + V-ing/to V + time + ago

-> S + have/has + V3/ed + for + time

`7.` He has taught English since he was seniour at colleage.

- S + started/begun + V-ing/to V + when + QKĐ

-> S + have/has + V3/ed + since + QKĐ

`8.` This is the first time I have tried this motorbike.

- S + have/has + never + V3/ed + before

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

`9.` Sai đề

`10.` I have never learnt such a more interesting subject than this.

- S1 + tobe + the + adj + -est/most + adj + N + S2 + have/has + ever + V3/ed

-> S2 + have/has + never + V3/ed + such + a/an + adj + -er/more + adj + N + than + S1 

`12.` He has gone this recreational centre since he was at the of 15.

- Tương tự câu 7

`13.` This is the first time I have come to Hai Phong.

- Tương tự câu 8

`14.` This is the first time my student have done this like coming too lately. 

- Tương tự câu 8

`15.` I have never taught such a nicer student than this one.

- Tương tự câu 10