If an entire building is not on fire, then the building isnt burning
If a glass is not full of anything, then its empty.
If an entire pizza is eaten, then there isnt any pizza left.
Are you seeing the pattern here?
That's not what OP said though. If an entire building is not on fire, then the building isn't not on fire. If an entire pizza is eaten, then the pizza isn't eaten.
Oh youre right. I must have read it wrong, by reading it wrong.
If everybody is crazy then no one is crazy
If an entire society is a society, then we live in a society
Finally, a comeback I can use when people tell me I'm a terrible singer!