story: One day Joe was upset. His father told him that they would go on a motorcycle trip. They decided to go when Joe turned 21. When Joe was 21 he and his father bought motorcycles. The had a great trip together.
 selected sentence: They decided to go when Joe turned 21.
Joe and his father feel(s) optimistic about the future >Motivates> Joe and his father plan a trip for when Joe is 21