`41`. The last time we met one another was when we left school.

- S + have/has + not + Vpp + (O) + since + S + Ved/ V2.

+ have not = haven't

+ has not = hasn't

+ "We" là ngôi số nhiều nên trợ động từ là "haven't"

= The last time + S + Ved/ V2 + (O) + was + when + S + Ved/ V2.

`42`. I haven't made such a stupid mistake before.

- This/ It is the first time + S + have/has + (ever) + Vpp + (O).

= S + have/has + not + Vpp + (O) + before.

`43`. It started raining five hours ago.

*Hiện tại hoàn thành tiếp diễn -> Quá khứ đơn

- S + have/has + been + V-ing + for + time.

= S + started/ began + to V/ V-ing + time + ago.

`44`. They haven't visited their homeland for over two years.

- It + to be + time + since + S + (last) + Ved/ V2 + (O)

= S + have/has + not + Vpp + (O) + for + time.

- left (V2) rời đi ; visited (Ved) thăm

`45`. I've never met a punctual person like your brother.

- S1 + to be + superlative + S2 + have/has + ever + Vpp.

= S2 + have/has + never + Vpp + (a/an) + adj + N + like + S1.

`46`. Nam and his family had a two-day trip.

- Danh từ ghép có dạng: N1-N2 + N3.

+ N1-N2 bổ nghĩa cho N3

+ N2 là danh từ chỉ thời gian thì không chia hình thức số nhiều

`47` It's years since I last enjoyed myself so much.

- S + have/has + not + Vpp + (O)  for + time.

= It + to be + time + since + S + (last) + Ved/ V2.