Ex1:

5/ would have enjoyed

6/ had known

7/ had stopped

8/ had called

Ex2:

1/ If I had been hungry, I would have eaten something.

2/ If I had known you were sick yesterday, I would have gone to see you.

3/ If Mary hadn't worn a seat belt, she would have been injured in the crash.

4/ If I had had money on me, I would had gotten a taxi.

5/ If it had rained, I would have gone for a walk.

Ex3:

1/ If they had paid attention, they would have seen the sign marking their exit from the high way.

2/ If the sun hadn't shone, we would have gone to the beach yesterday.

3/ If the music hadn't played loudly at the restaurant, I would have heard everything Mr. Lee said during the dinner.

4/ If Rosy hadn't studied, she would have answered the phone.

5/ If he hadn't listened to music, he would have known what his father was saying.