I read books.
I don't read books.
You are thirsty.
You aren't thirsty.
This is a kite.
This isn't a kite.
I have a fish.
I don't have a fish.
We like salad.
We don't like salad.
She can sing.
She can't sing.
I can play the guitar.
I can't play the guitar.
Ashley is a doctor.
Ashley isn't a doctor.
They work in a police station.
They don't work in a police station.
This is a classroom.
This isn't a classroom.
I am sad.
I am not sad. (=I'm not sad.)
I can play soccer.
I can't play soccer.
They are doors.
They aren't doors.
You have a rabbit.
You don't have a rabbit.