3. You should learn about the rules carefully.
If I were you, I would learn about the rules carefully.
7. Without his device, I couldn't pass the exam.
If there had been his device, I could have passed the exam.
8. He doesn't know how to swim, so he never takes boat trips.
If he knows how to swim, he will takes boat trips.
9. Due to that terrible accident, the park was closed.
If that terrible accident didn't happen, the park will open.
10. But for the map, we couldn't have found the way out of the forest.
Without the map, we could have found the way out of the forest.