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: Sam was excited go to shopping. He had a coupon that gave him a great deal. Sam got everything he wanted and went to pay. The cashier gave him terrible news about the coupon. It had just recently expired.
 selected sentence: Sam was excited go to shopping.

Sam goes shopping >Causes/Enables> Sam is excited to go shopping