Definition: In this task, you will be given a short story. One sentence from the story is chosen. Consider the events that happen before that sentence, or are likely to have happened before it. Does any of them directly cause it, or simply make it possible? You should write your answer in the form " A >causes/enables> B". Try to use phrases and sentences from the story to compose your answer when possible.
Input: story: Bill was walking home when he saw a dog in trouble. The dog was on a chain but had tried to jump the privacy fence. Now the dog was hanging by its collar about two feet off the ground. Bill ran over and lifted the dog up so it could breathe. A neighbor came to help and together they rescued the dog.
 selected sentence: Bill ran over and lifted the dog up so it could breathe.

A dog is in trouble >Causes/Enables> Bill runs over to help