1 If he didn't have to study for his Exam , he could go out 

=> câu điều kiện ở HT ta lùi về if 2

2 If she didn't lazy, she could pass the exam

=> câu đk ở HT lùi về if loại 2

3 If he didn't smoke too much, he could get rid of his cough 

=> câu đk ở HT lùi về if 2 

4 If I hadn't felt tired, I could have played football this afternoon

=> vì câu này ko thực ở quá khứ lùi về if 3

5 If Olga and Ivan had been paying attention, they would have seen the sign marking their exit from the highway

=> ko thật ở quá khứ lùi về if loại 3

6 If she had a college degree, she couldn't be employed

=> ko thật ở HT lùi về if 2

7If she hadn't walked to the meeting, she wouldn't have been late

=> câu ko thật ở quá khứ lùi về if 3

8If you promise to return back, I will lend you

=> câu có thể thực hiện đc chia if loại 1

9 If the weather hadn't been terible, we wouldn't have put off our trip

=> câu ko thật ở quá khứ lùi về if 3

10If Sally had known what she had to do for homework, she wouln't have been absent from school on Friday

=> câu ko thật ở quá khứ lùi về if 3

11 Unless you like this one, I will bring you another 

=> Unless là có sẵn từ ko rồi nên không cần pk thêm not

12 But for he was nervous, he wouldn't have failed his driving test

=> but for cx là 1 dạng của if loại 3

13 If he pay me tonight, I will have enough money to buy a car

=> câu điều kiện có thể thực hiện đc chia if loại 1

14 If you leave me alone, I won't call the police

=> câu có thể thực hiện đc chia if loại 1

15 should you turn on the air- conditioner if you arrive at the office earlier than I do

=> câu if loại 1

16 had it been a famous musician by now if he wouldn't have died so young

=> if 3 loại đảo

17 were you take care of the car , it wouldn't break down so often

=> if loại 2 đảo

18 If you don't tell lies to your boss, you won't be fired

=> if có thể thực hiện đc trong HT lùi về if 1

19 Had he passed the exam if he would have revised all his lessons

=> if ko thật ở quá khứ lùi về if 3

20 If Rita had got some sleep last night, she wouldn't have exhausted today

=> if ko thật ở quá khứ lùi về if 3

Học tốt!!!

`1` If he didn't have to study for his exam, he could go out.

Câu ĐK loại 2: If+ S+ V-ed/ V2, S+ would/could/should (not)+ V-inf.

`2` If she didn't lazy, she could pass the exam.

Câu ĐK loại 2: If+ S+ V-ed/ V2, S+ would/could/should (not)+ V-inf.

`3` If he didn't smoke too much, he could get rid of his cough.

Câu ĐK loại 2: If+ S+ V-ed/ V2, S+ would/could/should (not)+ V-inf.

`4` If I hadn't felt tired, I could have played football this afternoon.

Câu ĐK loại 3: If+ S+ had(not)+ Vp2, S+ would/could/should (not)+ have+ Vp2.

`5` If Olga and Ivan had been paying attention, they would have seen the sign marking their exit from the highway.

Câu ĐK loại 3: If+ S+ had(not)+ Vp2, S+ would/could/should (not)+ have+ Vp2.

`6` If she had a college degree, she couldn't be employed.

Câu ĐK loại 2: If+ S+ V-ed/ V2, S+ would/could/should (not)+ V-inf.

`7` If she hadn't walked to the meeting, she wouldn't have been late.

Câu ĐK loại 3: If+ S+ had(not)+ Vp2, S+ would/could/should (not)+ have+ Vp2.

`8` If you promise to return back, I will lend you.

Câu Đk loại 1: If+ S+ V(s/es), S+ will/can/may (not)+ V-inf.

`9` If the weather hadn't been terrible, we wouldn't have put off our trip.

Câu ĐK loại 3: If+ S+ had(not)+ Vp2, S+ would/could/should (not)+ have+ Vp2.

`10` If Sally had known what she had to do for homework, she wouldn't have been absent from school on Friday.

Câu ĐK loại 3: If+ S+ had(not)+ Vp2, S+ would/could/should (not)+ have+ Vp2.

`11` Unless you like this one, I will bring you another.

Cấu trúc Unless dạng điều kiện loại 1: Unless+ S+ V(s/es), S+ will/ can/ shall+ V-inf.

`12` But for he was nervous, he wouldn't have failed his driving test.

Cấu trúc: But for+ Clause 1, S+ would(not) have+ Vp2. 

`13` If he pays me tonight, I will have enough money to buy a car.

Câu Đk loại 1: If+ S+ V(s/es), S+ will/can/may (not)+ V-inf.

`14` If you leave me alone, I won't call the police.

Câu Đk loại 1: If+ S+ V(s/es), S+ will/can/may (not)+ V-inf.

`15` Should you turn on the air-conditioner if you arrive at the office earlier than I do.

Câu đảo ngữ câu điều kiện loại 1: Should+ S+ V-inf, S+ will+V-inf.

16 Had it been a famous musician by now if he wouldn't have died so younger.

Câu đảo ngữ câu điều kiện loại 3: Had+ S+ Vp2, S+ would(not) have+ Vp2.

`17` Were you take care of the car, it wouldn't break down so often.

Câu đảo ngữ câu điều kiện loại 2:

- Were+ S+ to+ Vinf, S+ would+ V-inf.
- Were+ S+ N/ Adj, S+ would+ V-inf.

`18` If you don't tell lies to your boss, you won't be fired.

Câu Đk loại 1: If+ S+ V(s/es), S+ will/can/may (not)+ V-inf.

`19` Had he passed the exam if he would have revised all his lessons.

Câu ĐK loại 3: If+ S+ had(not)+ Vp2, S+ would/could/should (not)+ have+ Vp2.

`20` If Rita had got some sleep last night, she wouldn't have exhausted today.

Câu ĐK loại 3: If+ S+ had(not)+ Vp2, S+ would/could/should (not)+ have+ Vp2.