1. You would have met my cousin from Canada if you had gone to the party.
2. I could have done better in my maths exam if I had revised for it.
3. Would they have been healthier if they had lived in your country?
4. If she hadn't driven so fast, she wouldn't have had an accident.
5. If he had gone to the university, he might not have become a rock star.
6. What would have I done if I hadn't found my keys?
7. I wouldn't have caught the train if they hadn't given me a lift to the station.
8. If the weather hadn't been bad, they could have reached the top of the mountain.
9. We wouldn't have asked him to help us if we had known he was so busy.
10. If he hadn't won a scholarship, he wouldn't have gone to the USA to study for a year.