[michèle 2]

As this structure : Do + subject+ v for interrogative form doesn't exist in French , I think that exercises like : fill in the blanks with do or does , make questions using do, does....can be a start to train your students. Or play a game where you have to guess the person's job by asking questions
For example: Does he use a hosepipe? Yes, he does. Does he wear a uniform ? Yes, he does ect....Who is he? he's a fireman.
they'll get used to it.