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: Henry had a friend over. She was ready to go home. It was dark so he walked her home. They had to go down three streets. Then, he said goodbye to her at her door.
 selected sentence: They had to go down three streets.

Henry's friend is going home >Causes/Enables> Henry's friend has to go down three streets