The book says: A long time ago, a prince was turned into a little frog with big eyes, long tongue and green clothes by a witch. One day, a princess was playing with her beautiful crystal ball by the stream and accidentally dropped it into the stream. The princess began to cry by the stream. When the prince who was turned into a frog by a witch heard this, he jumped in front of the princess and asked her, "Princess, why are you crying?"

The princess looked down and found it was a little frog. She said to him, "I accidentally dropped the crystal ball into the stream."

The little frog said, "I can help you get the crystal ball back."

The princess asked, "Really?"

The little frog said, "Yes, but on one condition."

The princess asked, "What conditions?"

The little frog said, "You should be friends with me."

The princess said, "Good."

The little frog picked up the crystal ball from the stream and gave it to the princess, but the princess got the crystal ball and ran back to the castle, ignoring the little frog. At night, the little frog knocked on the door of the castle in his handsome clothes. As soon as the princess opened the door and saw the little frog, she closed the door at once. The king asked the princess what happened. The king criticized the princess, asked the princess to open the door to let the frog in, and asked the princess and the little frog to eat with plates. At night, the princess and the little frog sleep in the same bed. The next day, the little frog became a handsome prince.

This book is very vivid. After reading this book, I know that anyone should keep his promise. When you do this, sometimes you will get unexpected gains.