Are you eating?
Yes, I am
What are you doing?
I'm studying.
What are you doing?
I'm writing.
What are you doing?
I'm talking.
What are you doing?
I'm drinking.
Are you singing?
No, I'm not.
Is he studying?
Yes, he is.
Is she laughing?
No, she isn't.
What are you doing?
I'm drawing.