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