Once upon a time, there was a big fish named Fin. Fin loved to dive deep in the water. He had many friends who liked to play with him. They would all dive together and have lots of fun.
One day, Fin met a new friend named Tim. Tim was a little crab who had a lot of pretty shells. Fin thought the shells were very nice. Tim said, "I will trade you a shell for a big dive with you." Fin was happy and said, "Yes, let's trade!"
Fin and Tim had a great time diving and trading shells. Fin was very generous and gave Tim some of his own shells too. They played all day, and in the end, they were the best of friends. And they lived happily ever after.
