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: Tommy has a red balloon. It's his favorite color! But one day, the balloon lost it's air. Tommy was very sad. But he'll get a new balloon tomorrow, so it's not that bad.
 selected sentence: Tommy was very sad.

Tommy's balloon deflates >Causes/Enables> Tommy is sad