Question 1.
I can't play football this afternoon because I felt tired. → If I didn't feel tired, I would play football this afternoon.

Question 2.
Don’t tell lies to your boss or you'll be fired at once. → If you tell lies to your boss, you will be fired at once.

Question 3.
She walked to the meeting. She was late. → If she hadn't walked to the meeting, she wouldn't have been late.

Question 4.
She is lazy so she can't pass the exam. → If she wasn't lazy, she would pass the exam.

Question 5.
Leave me alone or I'll call the police. → If you don't leave me alone, I will call the police.

Question 6.
He didn't revise all his lessons, so he failed the exam. → Had he revised all his lessons, he wouldn't have failed the exam.

Question 7.
If you arrive at the office earlier than I do, please turn on the air-conditioner. → Should you arrive at the office earlier than I do, please turn on the air-conditioner.

Question 8.
He will pay me tonight; I will have enough money to buy a car. → If he pays me tonight, I will have enough money to buy a car.

Question 9.
The car breaks down so often because you don't take good care of it. → Were you to take good care of the car, it wouldn't break down so often.

Question 10.
He can't go out because he has to study for his exam. → If he didn't have to study for his exam, he would go out.

Question 11.
Rita is exhausted today because she didn't get any sleep last night. → If Rita had gotten some sleep last night, she wouldn't be exhausted today.

Question 12.
Martin failed his driving test last week because he was very nervous. → But for Martin's nervousness, he would have passed his driving test last week.

Question 13.
Olga and Ivan weren't paying attention, so they didn't see the sign marking their exit from the highway. → If Olga and Ivan had been paying attention, they would have seen the sign marking their exit from the highway.

Question 14.
She can't be employed because she doesn't have a college degree. → She would be employed if she had a college degree.

Question 15.
Unless you promise to return back, I won't lend you. → If you don't promise to return back, I won't lend you.

Question 16.
Sally doesn't know what she has to do for homework because she was absent from school on Friday. → Sally would know what she has to do for homework if she hadn't been absent from school on Friday.

Question 17.
He died so young; otherwise, he would be a famous musician by now. → Had it not been for his early death, he would be a famous musician by now.

Question 18.
He smokes too much; that's why he can't get rid of his cough. → If he didn't smoke too much, he would be able to get rid of his cough.

Question 19.
We put off our trip because the weather was terrible. → We wouldn't have put off our trip if the weather hadn't been terrible.

Question 20.
If you do not like this one, I'll bring you another. → Unless you like this one, I'll bring you another.