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