`1.` Unless someone puts the coal in, the fire will go out.

`2.` Unless he studies hard, he won't pass the coming exam. 

`3.` Unless she hurries, she will miss the train.

`4.` If he doesn't take these pills, he won't be better.

`5.` Unless someone has a key, we can't get into the house.

`6.` If you don't drive your bike carefully, you may have an accident. 

`7.` If you work hard, you will pass the exam.

`8.` If he leave soon, he won't miss the bus.

`12.` If he doens't phone her immediately, he won't get information.

`-` Cấu trúc câu gốc:

`->` V/be `+` O `+` or/and `+` S `+` V `+` ... 

`->` Vì câu gốc diễn tả sự việc có thể xảy ra ở tương lai. Nên ta sử dụng câu điều kiện loại `1.`

`=` Cấu trúc câu điều kiện loại `1:`

`->` If `+` S `+` am/is/are `+` N/Adj `+` ..., S `+` can/should/will `+` V-inf 

`->` If `+` S `+` V(s/es)`/`don't/doesn't + V-inf, S `+` will/can/should `+` V-inf 

`+` Mệnh đề If: S `+` V(present simple `-` HTĐ)

`+` Mệnh đề chính: S `+` will/can/should `+` V-inf

`->` Dùng để dự đoán một hành động, sự việc có thể xảy ra trong tương lai.

`@` Lưu ý: Unless `=` If ... not

`-` Cấu trúc: Unless `+` S `+` am/is/are + N/Adj`/`V(s/es), S + will/can/shall + V

`=` If `+` S `+` am/is/are not `+` Adj/N`/`don’t/doesn’t + V, S `+` will/can `+` V

`----------------`

`9.` She asked me if it was going to be a fine day that day.

`-` Cấu trúc câu tường thuật với câu hỏi Yes/No question:

`->` S `+` asked/ wanted to know/ wondered `+` if/whether `+` S `+` V(lùi thì)b

`-` Lùi thì: TLG `->` TLG trong quá khứ.

`@` Am/Is/Are `+` going to V `->` Was/Were `+` going to V

`-` Đổi trạng từ chỉ thời gian: Today `->` That day

`10.` A new school was built last year.

`-` Bị động QKĐ: S `+` was/were `+` PII `+` (by O)

`11.` We have waited here since `8` a.m.

`@` Cấu trúc của câu:

`-` S `+` began/started `+` V-ing/to-V `+` in/at/when ... `/`ago `+` ...

`->` Ai đó bắt đầu làm việc gì ...

`=` S `+` have/has + Ved/C3 `/` have/has + been + V-ing `+` since/for 

`->` Ai đó làm việc gì được bao lâu ...

 `-` Cấu trúc Since (Kể từ khi): S `+` V(HTHT) `+` since `+` S `+` V(QKĐ)

1. Unless someone puts the coal in, the fire will go out.

2. Unless he studies hard, he won't pass the coming exam. 

3. Unless she hurries, she will miss the train.

4. If he doesn't take these pills, he won't be better.

5. Unless someone has a key, we can't get into the house.

6. If you don't drive your bike carefully, you may have an accident. 

7. If you don't work hard, you won't pass the exam.

8. If he leave soon, he won't miss the bus.

9. She asked me if it was going to be a fine day that day.

- Câu tường thuật: Dạng Yes/No questions: S + asked sb/ wondered/ wanted to know + if/whether + S + V(lùi thì)

10. A new school was built last year.

- Bị động: QKĐ: S + was/were + V3/ed + (by O)

11. We have waited here since 8 a.m.

- S + started/began + V-ing/ to V + at + time = S + have/has + V3/ed + since + mốc thời gian

12. If he doesn't phone her immediately, he won't get information.

- (Don't +) V(bare) + O, or + S + will/can/may/... + (not) + V(bare) + O

-> Câu điều kiện loại 1: If + HTĐ, S + will/can/may/... + (not) + V(bare) + O

- Unless = If not

- Câu điều kiện loại 1: If + HTĐ, S + will/can/may/... + (not) + V(bare) + O

+ Thì HTĐ:

(+) S + V(s/es) 

(-) S + don't/doesn't + V(bare)

-> Unless + S + V(s/es), S + will/can/may/... + (not) + V(bare) + O

- Lưu ý: Mệnh đề chứa từ "Unless" luôn ở dạng khẳng định