Subject-Verb Inversion :
The normal English order of subject-verb-completer is disturbed only occasionally but under several circumstances. Burchfield* lists about ten situations in which the subject will come after the verb. The most important of these are as follows (subjects in blue):
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In questions (routinely): "Have you eaten breakfast yet?" "Are you ready?"
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In expletive constructions: "There were four basic causes of the Civil War." "Here is the book."
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In attributing speech (occasionally, but optionally): "'Help me!' cried Farmer Brown."
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To give prominence or focus to a particular word or phrase by putting the predicate in the initial position: "Even more important is the chapter dealing with ordnance."
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When a sentence begins with an adverb or an adverbial phrase or clause: "Seldom has so much been owed by so many to so few."
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In negative constructions: "I don't believe a word she says, nor does my brother. Come to think of it, neither does her father."
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After so: "I believe her; so does my brother."
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For emphasis and literary effect: "Into the jaws of Death, / Into the mouth of Hell / Rode the six hundred."**
There are other uses of inversion, but most of those result in a strained or literary effect.