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2. If the road hadn't been icy, the accident wouldn't have happened.
3. If I had known that he had to get up early, I would have woken him up.
4. If I hadn't lost my phone, I could have called you.
5. If Karen hadn't been wearing a seat belt, she would have been injured in the crash.
6. If you had had breakfast, you wouldn't be hungry now.
7. If I had had enough money, I would have got a taxi.
4/
3. I knew
4. I had taken
5. I could come
6. I were not
7. they would hurry up
8. we didn't have
9. we could have stayed
10. it weren't
11. would decide
12. we hadn't gone