Is she walking?
No, she isn't walking.
Are they cleaning the house?
yes, they are cleaning the house.
What is he doing?
He is drinking coffee.
What is he doing?
He is watching youtube
What are they doing?
They are talking.
Is he studying?
Yes, he is studying
Is she playing guitar?
No, she isn't playing guitar.
What is he doing?
He is reading a book.
What is she doing?
She is running