The moral of The Fox and the Grapes is that sometimes we want things that we cannot have, and we have to be okay with that.
Some questions that I would ask students about this fable are:
1. How did the fox handle not being able to reach the grapes?
2. Do you think the grapes were really sour?
3. Give me an example of a time when you wanted something but could not have it. How did you react to this situation?
4. How could have the fox have reacted to this situation differently?