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: Sarah loved to watch the birds in her yard. One day, she saw a beautiful bird in her yard. The bird had a friend and they kept flying around each other. Sarah was really excited because she knew they were in love. Later that year, Sarah saw a nest full of eggs next to the two birds!
 selected sentence: Sarah was really excited because she knew they were in love.

Sarah loves watching birds >Causes/Enables> Sarah is excited watching the birds