Question tags are made of an auxiliary verb plus a pronoun, which go at the end of a sentence, either to ask for more information about something, or to confirm something which we believe is true. The auxiliary verb matches the tense of the main verb and the pronoun comes directly from the noun. Question tags can either have a rising or falling intonation depending if you want to genuinely ask for the answer or expect someone to agree with you. Finally, Question tags usually work in opposition. If the main sentence is affirmative, then the question tag is usually negative, so: You do live here, don’t you? and vice versa.
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