Do-support

do''-supportauxiliary ''dodoDo-periphrasisinsertedstandard English has itsupportthe auxiliary is taken from the emphatic ''do'' form
Do-support (or do-insertion), in English grammar, is the use of the auxiliary verb do, including its inflected forms does and did, to form negated clauses and questions as well as other constructions in which subject–auxiliary inversion is required.wikipedia
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