Помогите пожалуйста. Это задание на глагол to be.

I am running.
A dog is playing.
He is watching TV.
We are talking about holidays.
Jack and Alice are singing songs.
You are playing the piano.
They are having their breakfast.

She isn't riding a bike.
I am not discussing computer games.
He isn't reading this book.
John and Mary aren't listening to music.
My sisters aren't drawing pictures.
Her mother is working now.
You aren't cooking now.

are you going to the theatre?
What is he cooking?