`color{red}{#Atr}`

`16.` My friend has dived into this ocean in Ha Long Bay for `2` hours.

`17.` This student has fought with others since he was in the primary school.

`18.` This / It is the first time my teacher have found this kind of student like him.

`19.` This / It is the first time I have seen such a beautiful girl.

`20.` He has never forbidden dangerous activity before.

`21.` She has foregone cigarrete for 2 minutes.

`22.` He has foretold his girlfriend's idea since she said the first word.

`23.` It / This is the first time we have foresee his thought but her.

`24.` It / This is the first time she has frozen this pierce of polk.

`25.` I have never presell for my customers breathtaking photos.

`------`

`@` Chuyển câu với thì

`1.` S + last + QKĐ + times ago / in + time.

`=` S + have/has + not + Vp2 + for times / since time.

`=` It's + time + since + S + last + QKĐ

`=` The last time + S + QKĐ + was + times ago / in time.

`2.` S + started / began + to V-bare / V-ing + times ago / in time

`=` S + have/has + Vp2 + for times / since time.

`=` It's + times + since + S + QKĐ

`3.` S + have/has + never + Vp2 + such + (a/an) + adj + N + before

`=` It / This + is the first time + S + have/has + (ever) + Vp2 + such (a/an) + adj + N

`=` It's the + so sánh nhất + N + S + have/has + (ever) + Vp2

`16.` My friend has dived into this ocean in Ha Long Bay for `2` years .

`17.` This student has fought with others when he was in the primary school .

`18.` This is the first time my teacher have found this kind of student like him.

`19.` This is the first time I have seen such a beautiful girl .

`20.` He has never forbidden dangerous activity before .

`21.` She has forego cigarrete for `2` minutes .

`22.` He has foretell his girlfriend's idea since she said the first word .

`23.` This is the first time we have ever foresee his thought but her.

`24.` This is the first time I have frozen this pierce of polk .

`25.`  I have never presell for my customers breathtaking photos

`@`$\text{Kiến thức :}$

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

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

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

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

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

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

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

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