story: One day Sam got lost from his mom in the mall. He looked behind all the clothes racks but couldn't find her. He looked in all the other stores but still couldn't find her. She wasn't in the food court, so Sam asked a security guard to help. When the security guard found Sam's mom, he was so glad to see her!
 selected sentence: When the security guard found Sam's mom, he was so glad to see her!
Sam is glad >Causes> Sam feel(s) happy