They're reading.
Make the question.
What are they doing?
Yes, they're! They're talking
Make the question
Are they talking?
Is he reading?
No, he isn't. He's erasing
What are they doing?
They're cutting
What is she doing?
She's painting
Is she painting?
Yes she is!
He's counting.
Make the question
What's he doing?
Is he cutting?
No, he isn't. Hes gluing
What are they doing?
They're reading!
What's he doing?
He's erasing the board!