Kết hợp câu dùng câu điều kiện

Exercise 4: Kết hợp câu dùng câu điều kiện
1. He can't go out because he has to study for his exam.
®If .................................................................................................................................
2. She is lazy so she can't pass the exam.
®If .............................................................................................................................
3. He smokes too much; that's why he can't get rid of his cough.
®If ................................................................................................................................. 
4. I can't play football this afternoon because I felt tired.
®If ............................................................................................................................. 
5. Olga and Ivan weren't paying attention, so they didn't see the sign marking their exit from the highway.
®If .........................................................................................................................
6. She can't be employed because she doesn't have a college degree.
®If .............................................................................................................................. 
7. She walked to the meeting. She was late.
®If ............................................................................................................................... 
8. Unless you promise to return back, I won't lend you.
®If ............................................................................................................................ 
9. We put off our trip because the weather was terrible.
®If ............................................................................................................................... 
10. Sally doesn't know what she has to do for homework because she was absent from school on Friday.
®If .............................................................................................................................. 
11. If you do not like this one, I'll bring you another.
®Unless ......................................................................................................................... 
12. Martin failed his driving test last week because he was very nervous.
®But for................................................................................................................... 
13. He will pay me tonight; I will have enough money to buy a car.
®If .............................................................................................................................. 
14. Leave me alone or I'll call the police.
®If ................................................................................................................................. 
15. If you arrive at the office earlier than I do, please turn on the air-conditioner.
®Should.................................................................................................................. 
16. He died so young; otherwise, he would be a famous musician by now.
®Had it ..........................................................................................................................
17. The car breaks down so often because you don't take good care of it.
®Were you .................................................................................................................. 
18. Don’t tell lies to your boss or you'll be fired at once.
®If ........................................................................................................................... 
19. He didn't revise all his lessons, so he failed the exam.

®Had .............................................................................................................................
20. Rita is exhausted today because she didn't get any sleep last night.
®If .............................................................................................................................