story: John didn't have many friends in his class. He had just moved earlier in the year. He was reading the book Tom Sawyer at recess. A boy walked up, telling him it was his favorite book. He and the boy ended up becoming friends after that.
 selected sentence: A boy walked up, telling him it was his favorite book.
John reads Tom Sawyer at recess >Causes/Enables> A boy tells John that it was his favorite book