A positive sentence tells you that something is so.
A sentence that tells you something is not so is called
a negative sentence. It contains a negative word like
not, never, no, no one, nobody, none, or a negative
verb like isn’t or can’t or won’t.
Peter is running.
We should tell the truth.
Everyone is in the garden.
The fridge is empty.
He is not walking.
We should never tell lies.
There is no one in the house.
There is nothing in it.
Kaynak: Basic English Grammar Book