`3.` This is the first time he has been here.

`-` CT: It/This is the first time + S + have/has + (ever) + Vpp

`->` Đây là lần đầu tiên ai đó làm điều gì

`=` S + have/has + not/never + Vpp + before

`4.` It's four years since Robert and Catherine got/were married.

`-` CT: S + have/has + Vpp + for + (khoảng thời gian)

`=` It + tobe + (khoảng thời gian) + since + S + Ved/c2

`-` get married: kết hôn

`7.` I have never tasted such a delicious cake before.

`-` CT: S + tobe + so sánh hơn nhất + S + have/has + (ever) + Vpp

`=` S + have/has + Vpp + such + a/an + adj + N + before

`8.` This is the first time she has ever seen a real tiger.

`color{red}{#Atr}`

`3.` This is the first time he has been here.

`4.` It's four years since Robert and Catherine got married.

`7.` I have never tasted such a delicious cake before.

`8.` This is the first time she has seen a real tiger.

`----`

`@` Chuyển câu với thì

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

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

`=` It's + times + 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's 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