The flood may rise higher. We have to move upstairs. A. We’ll have to move upstairs soon if the flood rises any higher B. Unless the flood rises any higher we won’t have to move upstairs

We’ll have to move upstairs soon if the flood rises any higher

Unless the flood rises any higher we won’t have to move upstairs

If we don’t move upstairs, the flood may rise higher

We have to move upstairs in case the flood rises any higher