Is she watering the flowers?
Yes, she is.
Is she sweeping?
Yes, she is.
Is he cooking?
Yes, he is.
Is she laying the table?
No, she isn't.
Is he painting?
No, he isn't.
Is she cooking?
Yes, she is.
Is he washing up?
Yes, he is.
Is he drying up?
No, he isn't.