`1.` A new kind of plants has just been produced.

`->` Bị động HTHT: have/has been Vpp (by O)

`2.` Unless she invites me, I don't come to her birthday party.

`->` Unless = If...not: Trừ khi

`3.` We haven't talked directly to each other for four weeks.

`->` S + last + V-ed + time + ago = S + have/has + not + Vpp + for + time.

`4.` Nam asked Nga if she was having a wonderful time there.

`->` Câu tường thuật lùi thì: HTTD `->` QKTD, here `->` there.

@ `Ly`

1. A new kind of plants has just been produced.

- Câu bị động thì hiện tại hoàn thành: has/ have+ been+ PII+ (by O)

2. Unless she invites me, I don't come to her birthday party.

- Unless = If...not: Nếu... không

3. We haven't talked directlyto each other for four weeks.

- S+ last+ V2+ khoảng thời gian+ ago-> S+ have/has+ not+ PII+ for+ khoảng thời gian.

4. Nam asked Nga if she was having a wonderful time there.

- Câu gián tiếp dạng Yes/ No question: S1+ asked+ if+ S2+ V(lùi thì)...