One day, a boy named Tim went to play outside. It was an icy cold day, but Tim put on his warm coat and hat. He saw his friends gather near the big tree. They were all talking and laughing.
"Hi, Tim!" said his friend, Sam. "We found a big eraser under the tree. We don't know where it came from. Let's play with it!"
Tim and his friends started to draw on the ground with sticks. Then, they used the big eraser to rub out their drawings. They laughed and played for a long time.
But then, something unexpected happened. The big eraser started to grow bigger and bigger! Tim and his friends were so surprised. They did not know what to do. The eraser became so big that it could rub out the whole tree! The friends looked at each other and decided to hide the big eraser so it could not grow any more. They learned that sometimes, it's better to leave things alone.
