One day, a boy named Tim found a zip. He did not know what it was for, but he liked it. He said, "This zip is mine." He put the zip in his pocket and went to play outside.
In the park, Tim met a girl named Sue. Sue saw the zip and wanted it. "Can I have the zip?" she asked. Tim said, "No, it is mine." Sue was sad, but she had an idea. She showed Tim her toy car. "If you give me the zip, I will give you my toy car," she said. Tim thought about it and said, "Okay."
Tim and Sue traded. Tim got the toy car and Sue got the zip. But the car was dirty. Tim did not like the dirty car. He wanted his zip back. He asked Sue, "Can I have my zip back?" Sue said, "No, the zip is mine now."
Tim was very sad. He went home with the dirty car. He lost his zip and had a bad day. The next time, Tim will think more before trading his things.
