1.If Jenny had understood the lesson,he would have answered.

2.If Carol hadn't been studying,she would have answered the phone.

3.If he had studied hard enough,he wouldn't have falied the exam.

4.If I hadn't been stuck in the traffic jam,I wouldn't have been late.

5.If he hadn't gone out in the rain last night,he wouldn't have the flu.

6.If John had found the money,he would have returned it.

7.If I had known you were there,I would have called you.

8.If it hadn't rained heavily,everyone would have gone out.

9.If Jimmy hadn't lent me the money,I wouldn't have gone out with business.

10.If you hadn't helped me, I wouldn’t have succeeded this project.

1. Jerry didn’t understand the lesson. He didn’t answer.

→ If Jerry had understood the lesson, he would have answered.

2. Carol didn’t answer the telephone because she was studying.

→ If Carol han't been studying, she would have answered the telephone.

3. Because he didn’t study hard enough, he failed in the exam.

→  If he had studied hard enough, he wouldn't have failed inthe exam.

4. I was stuck in the traffic jam; and that’s why I came late.

→ If i hadn't been stuck in the traffic jam, i wouldn't have come late

5. He had the flu because he went out in the rain last night.

→ If he hadn't gone out in the rain last night, he wouldn't have had the flu

6. John didn’t find the money. He didn’t return it.

→ If John had returned it, he would have found the money

7. I didn’t know you were there. I didn’t call you.

→ If i had known you were there, i would have called you

8. The heavy rain prevented everybody from going out.

→ If the rain hadn't been heavily, everybody would have gone out

9. Jimmy lent me the money. Otherwise, I would have gone out with business.

→  If Jimmy hadn't lent me the money, i wouldn't have gone out with business

10. Without your help, I wouldn’t have succeeded this project.

→ If you hadn't helped me, i wouldn't have succeeded this project