Ex3:

1. If you come late, they won't let you in.

2. If I knew Greek, I could tell you about (that?).

3. If you don't stop talking, you won't understand the lesson.

4. If you don't go right now, you will be late for the train.

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

6. If she weren't lazy, she could pass the exam.

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

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

9. If she weren't shy, she would enjoy the party.

10. If i get a work permit, I will stay for another month

Ex4:

1. Unless today were Monday, i would go to work.

2. Unless I have enough money, I won't buy a new skateboard.

3. Unless he visited me in hospital, I wouldn't be glad.

4. Unless they were rich, they wouldn't stay at a hotel.

5. Unless he offers me the job, I won't take it.

6. Unless you tell the truth, she will be angry.

7. Unless Jack came to my party, I wouldn't dance with him.

8. Unless they take their medicine, they won't feel better.

9. Unless you asked me, I wouldn't tell you.

10. Unless we learn hard, we won't get good marks.