Is she doing the washing up?
Yes, she is.
Is he doing his homework?
Yes, he is.
Is she playing the piano?
No, she isn't.
Is she cleaning?
No, she isn't.
Is she riding a bike?
Yes, she is.
Are they making a cake?
No, they aren't.
Are they making the bed?
Yes, they are.
Is he playing computer games?
No, he isn't.
Are they watering the plants?
Yes, they are.
Is he listening to music?
Yes, he is.
Is he eating breakfast?
No, he isn't.
Is he writing a book?
No, he isn't.
