There are two windows.
There aren't two windows.
You are thirsty.
You aren't thirsty.
I play the guitar.
I don´t play the guitar.
She has a fish.
She doesn´t have a fish.
She likes fish.
She doesn't like fish.
We live in Moscow.
We don't live in Moscow.
Ms. Green is a doctor.
Ms. Green isn't a doctor.
There is a table in the room.
There isn't a table in the room.
They work in a café.
They don't work in a café.
This is a man.
This isn't a man.
I have a bird.
I don't have a bird.
She sings.
She doesn't sing.
He likes salad.
He doesn't like salad.
There is a sofa.
There isn't a sofa.
They have bikes.
They don´t have bikes.