Are they skating?
Yes, they are.
Is he reading?
No, he isn't.
Is he running?
No, he isn't.
What is he doing?
He's riding a bike.
Are they playing tennis?
No, they aren't.
What is he doing?
He's swimming.
What are they doing?
They're dancing.
What is he doing?
He's eating.
What is she doing?
She's sleeping.
Is she eating?
No, she isn't.
Is she talking?
Yes, she is.
What is she doing?
She's singing.
Is he cooking?
Yes, he is.
What are they doing?
They're singing.
What is she doing?
She's cooking.
What is he doing?
He's watching TV.