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: Gerry was walking to work. On the way, he tripped on the sidewalk and landed on his back. Gerry went to the doctor. He found out that he had fractured his spine. Gerry was out of work for a few months.
 selected sentence: On the way, he tripped on the sidewalk and landed on his back.

Gerry walks >Causes/Enables> Gerry trips