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: On my birthday my friend gave me a present. The present was a ring. I lost the ring today. We looked everywhere for the ring. We couldn't find the ring.
 selected sentence: On my birthday my friend gave me a present.

My friend buys a ring >Causes/Enables> My friend gives me the ring