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: Steve walked into his barn to grab some hay to feed the horses. He tripped over a shovel and crashed into the hay pile. He realized the sewing kit in his pocket fell into the haystack. Steve found the kit but was missing a needle. Steve looked at the pile and cursed out loud.
 selected sentence: He tripped over a shovel and crashed into the hay pile.

Steve walked into the barn >Causes/Enables> Steve tripped over a shovel