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When a negative adverb (or adverbial phrase) is placed at the beginning of a sentence, we exchange the normal placement of subject and verb.

Why is that?

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marked as duplicate by tchrist, Matt Эллен, coleopterist, Kristina Lopez, RegDwigнt Mar 18 '13 at 18:34

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Not only do we invert the auxiliary in negative adverbial phrases, so too do we invert them in a host of other circumstances detailed here. –  tchrist Mar 18 '13 at 11:46