Where AREDO you come from? | where do you come from
TheinterrogativeformofverbsinthepresentsimpleisformedwithDO,notBE."Wheredoyoucomefrom?"isthereforecorrect;"Whereareyoucomefrom?"isnotcorrect.WhenBEisfunctioningasamainverb,DOisnotusedasanauxiliaryfortheinterrogative:"Whereareyoufrom?"WhenBE(oranyotherverb)isfunctioningasanauxiliary,theinterrogativeisformedbysubject-verbinversion:"Whereareyoucomingfrom?"
The interrogative form of verbs in the present simple is formed with DO, not BE. "Where do you come from?" is therefore correct; "Where are you come from?" is not correct.
When BE is functioning as a main verb, DO is not used as an auxiliary for the interrogative: "Where are you from?"
When BE (or any other verb) is functioning as an auxiliary, the interrogative is formed by subject-verb inversion: "Where are you coming from?"