Exercise 1: 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 ..............................................................................................................................................