1. If people cared much about environment, they wouldn't keep making it worse

Unless people didn't care much about enviromnet, they wouldn't keep making it worse

đk loại 2: If+ S+ quá khứ đơn, + S+would V

If not =Unless

2. I haven't been to Hoi An before

Cấu trúc: This is the first time + S + have/has + P2: Lần đầu làm gì

=> S+ have/has not + P2 + before

3.  My brother said he tried to learn hard to  pass the last exam

Cấu trúc: S + say(s)/said + (that) + S + V

4. Solar energy will used to save the Earth in the future

Cấu trúc: S+ will+ be + Vpp2

5. I used to walk to school when I was a student.

Cấu trúc: be used to + V

6. In spite of being short they still love playing sports.

In spite of+ V-ing/ N= Although

dịch: Mặc dù thấp bé nhưng họ vẫn thích chơi thể thao.

`1.`

`->` If people cared much about environment, they wouldn't keep making it worse.

`->` Unless people didn't care much about enviromnet, they wouldn't keep making it worse

`=>` Câu điều kiện loại `2`

`@` Lưu ý: If not `=` Unless

`=>` If + S + V2/ed, S + would/could/should/.... + V + ....

`2.` I haven't been to Hoi An before

`=>` Thì hiện tại hoàn thành

`=>` CPĐ: S + have/has + Vpp + O

`3.` My brother said he tried to learn hard to pass the last exam

`=>` Câu trường thuật

`=>` S + said + to/that + S + Lùi thì

`4.` Solar energy will used to save the Earth in the future

`=>` Câu bị động ở dạng thì tương lai đơn

`=>` S + will be + Vpp + (by O)

`5.` I used to walk to school when I was a student

`=>` S + used to + V + O: đã từng làm việc gì

`6.` In spite of being short they still love playing sports

`=>` In spite of + Ving/N + ...: Mặc dù