1. If I didn't meet my friends, I wouldn't be happy.
2. If they didn't work hard, they wouldn't be tired.
3. If it didn't rain, we would go out.
4. If Mary had woken me up, I wouldn't have gotten up late.
5. If they hadn't wanted to relax, they wouldn't have gone to the cinema.
6. If he hadn't dumped the rubbish onto the beach, he wouldn't have been fined.
7. If Tom didn't litter the rubbish everywhere, they wouldn't fine him.
8. If I had enough money, I could buy a new car.
9. If they weren't taken to the zoo to see the wildlife, they wouldn't be excited.
10. If I didn't help her, she couldn't find a good job.