Change into negative: They are old.
They aren't old
Change into negative: They are dogs.
They aren't dogs.
Change into negative: He is angry.
He isn't angry.
Change into negative: She is slow.
She isn't slow.
Change into negative: They are new books.
They aren't new books.
Change into negative: I am hungry.
I am not hungry.
Change into negative: I am a cat.
I am not a cat.
Change into negative: They are big.
They aren't big.
Change into negative: I am a policeman.
I am not a policeman.
