1. Unless it rains, we'll leave early in the morning.
2. If we don't catch the bus, we'll walk to the next stop.
3. Unless we are careful, we will fall down the stairs.
4. If your hat isn't tied well, it will be blown away.
5. Unless your hat is tied well, it will be blown away.
6. If we don't study, we won't pass the exam.
7. Unless we study, we won't pass the exam.
8. If you don't use the sailboat, we'll use it.
9. Unless you use the sailboat, we will use it.
10. If she doesn't miss the train, she'll get there by this afternoon.
11. Unless she misses the train, she'll get there by this afternoon.
12. If Bill isn't at home, I don't know where he is.
13. Unless Bill is at home, I don't know where he is.
14. If the museum isn't closed, we'll stay until 2.
15. Unless the museum is closed, we'll stay until 2.

Unless it rains, we'll leave early in the morning.

If we don't catch the bus, we'll walk to the next stop.

If we aren't careful, we'll fall down the stairs.

Unless your hat is tied well, it will be blown away.

Unless we study, we won't pass the exam.

Unless you use the sailboat, we will.

Unless she misses the train, she'll get there by this afternoon.

Unless Bill is at home, I don't know where he is.