Are you going now?
Is it raining?
Are you enjoying the film?
Is that clock working?
Are you writing a letter?
(you / go / now?) -> are you going now?
(it /rain?) -> does it rain?
(you / enjoy / the film?) -> do you enjoy the film?
that clock / work?) -> does that clock work?
(you/ write / a letter?)\ -> do you write a letter?