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: I've always wanted to ride on a river boat. The kind with the big water wheel that went on the Mississippi river. I saw one once in an old movie. I guess the water wheel doesn't change much but I bet it's more quiet. I'm saving my money to ride one if I ever get the chance.
 selected sentence: I saw one once in an old movie.

I watch an old movie >Causes/Enables> I see a river boat in the old movie