1. A: They are eating at the moment.
N : They are not eating at the moment.
I : Are they eating at the moment?
2. A : They are playing now.
N : They are not playing now.
I : Are they playing now ?
3. A :You are writing the homeworks now.
N : You are not writing the homeworks now.
I : Are you writing the homeworks now?
4. A : They are reading a book now.
N : They are not reading a book now.
I : Are they reading a book now?