1 Some new schools have been built in the city.

- Bị động hiện tại hoàn thành: S + have/has + been + VpII + (by O)

2 Dave asked Susan why she hadn't done her homework the previous night.

- Tường thuật wh_q: S + asked + O + wh_q + S + V.

- QKĐ -> QKHT

- Last night -> The night before / The previous night

3 If he had enough qualifications, he would apply for the job.

- If 2: If + S + V2/ed, S + would/could... + V-inf + O.

4  I haven't seen my younger sister for six months.

- It + be + time + since + S + last + V2/ed + O: Lần cuối ai đó làm gì là bao lâu.

- = S + have/has + not + VpII + O + for / since + time: Ai đó chưa làm gì trong / từ khi bao lâu.

5 This girl writes more creatively than her sister does.

- So sánh hơn với tính từ/trạng từ dài: S1 + be / V + more adj / adv + than + S2.

6 Because of staying up late last night, he is tired now.

- S + V + O + because / since / as + S + V: Vì ...

- Because of / As the result of + N / V-ing, S + V + O: Vì ...

`1​.`Some new schools have been built in the city.

`-` S + have/ has + been + V3/ed + (by + O)
`2​.` Dave asked Susan why she didn't do her homework last night.

`-` S + asked + O(sb) + if/whether + Clause + S + V.
`3​.` He doesn't apply for the job because he doesn't have enough qualifications.

`-`Câu ĐK II : If + S + V-ed /V2, S + would/ could/ should + V1 (wouldn’t / couldn’t + V1) + O
`4​.` I haven't seen my younger sister for six months.

`-` It + is/has been + khoảng thời gian + since + S + last + V2-ed+ O `↔` S + have/ has + VpII
`5​.` This girl writes more creatively than her sister.

`-`S1 +to be + more + long adjective + than + S2
`6​.` He is tired now because he stayed up late last night.

`-` Because of / Due to + V-ing / Noun / pronoun, S + V