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: I met this little boy in the third grade. His name was billy. Billy and i fought the first day of school. Two weeks later we became first friends. From the third grade to adult we are still best friends.
 selected sentence: From the third grade to adult we are still best friends.

Billy and I become best friends >Causes/Enables> Billy and I are still best friends