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 went to the beach to look at the ocean. But he noticed that he was the only alone. He began to feel sad. Sam sadly continued to watch the ocean. But then he noticed Someone sit next to him.
 selected sentence: He began to feel sad.

Sam notices he is alone >Causes/Enables> Sam feels sad