I think I understan what you were asking, maybe. Were you asking about "doesn't it?"
They're called "tag questions" and are equivalent to our "¿no?". You have to ask them using the same auxiliary verb used in the sentence and, if there isn't any, you must use "do". For instance:
Vas a ir al cine hoy, ¿no?
You're going to the cinema today, don't you?
Te has comido todas las patatas, ¿no?
You have eaten all the potatoes, haven't you?
Deberías ir al médico, ¿no?
You should go to a doctor, shouldn't you?
I hope I'm not wrong, am I?