c'est bon = that's good
Ce n'est pas bon means 'this isn't good'.
Good, it isn't well.
The cast of Ce bon docteur - 1909 includes: Mistinguett Albens Paul Landrin
what's good [for diner] tonight? is the translation of 'quoi de bon ce soir'.
The cast of Ce bon La Fontaine - 1918 includes: Georges Colin Mary Harald
No, Eddie Haskell does not say "Ce si le bon." That phrase is in French and doesn't match his character from the TV show "Leave It to Beaver."
basically, "how long have you studied French?"
I'm still a good little boy this day
so, what do I say?
Ces't Ce Bon Vie
Is this not good for your health?
Ce n'est pas très bon.