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: Tim was in love. He was in love with Mary. He wanted to buy her flowers. He was very nervous. When he gave her the flowers she was very happy.
 selected sentence: He was very nervous.

Tim decides to give flowers to Mary >Causes/Enables> Tim is nervous