1. The weather was bad, so they cancelled the trip.
→ Because of the bad weather, they cancelled the trip.
2. Get up early or you'll be late for school.
→ If you get up early, you won't late for school.
3. If she doesn't wait for us, I'll lose.
→ Unless she waits for us, I will lose.
4. She didn't let us come in her room.
→ She wants to let us out of the room.
6. I don't like reading books, but I like watching TV.
→ I prefer watching TV to reading book.