Question 1: Keep silent or you'll wake the baby up. => If you don't keep silent, you'll wake the baby up.

Question 2: Stop talking or you won't understand the lesson. => If you don't stop talking, you won't understand the lesson.

Question 3: I don't know her number, so I don't ring her up. => If I knew her number, I would ring her up.

Question 4: Peter is fat because he eats so many chips. => If Peter didn't eat so many chips, he wouldn't be fat.

Question 5: If you do not like this one, I'll change you another. => Unless you like this one, I'll change you another.

Question 6: If she does not hurry, she'll be late (Unless = If ... not) => Unless she hurries, she'll be late.

Question 7: He can't go out because he has to study for his exam. => If he didn't have to study for his exam, he could go out.

Question 8: She is lazy so she can't pass the exam. => If she weren't lazy, she could pass the exam.

Question 9: 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 10: He smokes too much; that's why he can't get rid of his cough. => If he didn't smoke so much, he could get rid of his cough.  

Question 11: She is very shy, so she doesn't enjoy the party. => If she weren't very shy, she would enjoy the party.

Question 12: I will get a work permit. I will stay for another month. => If I get a work permit, I will stay for another month.

Question 13: He doesn't take any exercises. He is so unhealthy => If he took some exercises, he wouldn't be so unhealthy.

Question 14: Study hard or you won't pass the exam. => If you don't study hard, you won't pass the exam.