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