One day, Tim and his mom went to the park. Tim saw a big symbol on the ground. It was a big red circle with a line through it. Tim felt confused. He asked his mom, "What is that?"
His mom said, "That means we can't do something here. But I don't know what it is." They kept playing in the park, but Tim still thought about the symbol.
Then, a dog came running into the park. It had a ball in its mouth. The dog dropped the ball by the symbol. Tim and his mom looked at each other and laughed. "Now we know!" said Tim's mom. "The symbol means no dogs can play here. But this dog doesn't know that!" They played with the dog and had a fun day at the park.
