A fantasy is a make-believe story. The story has talking animals or magical things happen. The Narnia series is a good example of a fantasy series. When you write a fantasy story make the animals talk, trees whisper, and even make magical things out of ordinary stuff! That is how you make a fantasy story!
Here are some sample fantasy stories:
Sequel to Jasper
Butter's Amazing Adventure
Tacky Who Turned into Twighlight