story: Bill loved to draw different types of comic book heroes. His friend, Juan, liked to draw scenes about boats. The school was offering an art class on Saturdays. Bill decided to sign up for the art class. Juan thought it was a good idea, and signed up for the class, too.
 selected sentence: Juan thought it was a good idea, and signed up for the class, too.
Juan signs up for the art class >Causes/Enables> Juan buys supplies for the art class