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: Paul's car broke down. He needed to go to work, so he called a friend to ask for a ride. Paul's friend said that he would pick him up from work. When Paul's friend arrived, one of his back tires was low. Paul had to catch a taxi to work.
 selected sentence: When Paul's friend arrived, one of his back tires was low.

Paul calls a friend to ask for a ride >Causes/Enables> Paul's friend arrives