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: There was a big tree in our back yard. It grew to be a danger. We decided to take it down. It took a few hours of cutting and some planning. Eventually it fell over without hurting anybody.
 selected sentence: It grew to be a danger.

A big tree is in our back yard >Causes/Enables> The tree grows to be a danger