常考的几种倒装结构

　　1) 当表示否定或基本否定的词或词组位于句首作状语时用倒装。这类词或词组常用的有：never, nowhere, seldom, rarely, little, hardly, scarcely, barely, not until, not only, by no means, in no time, under no circumstances, under no condition, in no way, in no case, at no time, on no account等。
　　Never have I heard it before.
　　Nowhere can I find my lost watch.
　　Under no circumstance should a student cheat in the exam.
　　Not only was Churchill a statesman, but also a poet.

　　Note: 当 no sooner … than和hardly/scarcely … when/before位于句首时用倒装。该结构表示“一…就…”，在时态上主句一般用过去完成时，when或than引导的从句用一般过去时。
　　Hardly/Scarcely had I got home when/before the bell rang.
　　No sooner had the performance begun than the lights went out.