Réécrit ce texte en commençant par once upon a time ( il était une fois )
There is a frog who loves a princess. He keeps calling her. He thinks he knows her so well. That's why he wants to marry her . But there is a problem: the princess can't see the frog because she spends a lot of time in her castle. She only goes out when it's sunny. But when the sun shines, the frog stays in the water.
(Now we know a frog can't marry a princess)