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: Bob was fixing a light bulb. It took a long time. He just couldn't reach it. Alex gave him a ladder. After that Bob changed the bulb and was happy.
 selected sentence: Bob was fixing a light bulb.

The lightbulb was broken >Causes/Enables> Bob was fixing the lightbulb