4) fly, swim, drive, sing, watch, paint, play, dance.
5) Is he reading a book?
- Yes, he is.
Is he watching TV?
- No, he isn't.
Are they jumping?
- No, they aren't.
Are they making a sandcastle?
- Yes, they are.
Is she climbing?
- Yes, she is.
Is she singing?
-No, she isn't.