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: James was running before work. His knee started to hurt. He felt a sharp pain go down his leg. James had to walk back to his home. He had to take the rest of the week off from running.
 selected sentence: His knee started to hurt.

James is running before work >Causes/Enables> James' knee starts to hurt