2. Does she drive a bus? Yes, she does.
Is she driving a bus? No, she isn't.
What is she doing? She is playing the piano.
3. Does he clean windows? Yes, he does.
Is he cleaning a window? Yes, he is.
What is he doing? He is cleaning a window.
4. Do they teach? Yes, they do.
Are they teaching? No, they aren't.
What are they doing? They are watching TV.
