谓语+主语：称为倒装句
完全倒装条件：
一：
1、地点、时间、位置的副词在句首，
2、谓语动词为不及物动词
3、主语是名词而不是代词
(1) In came a teacher.
(2) Now comes your turn
二：
1、表地点的介词短语位于句首
2、谓语动词为不及物
Through the window came a terrible smell
三：
1、介词、介词短语位于句首
2、有系动词
Among the boys was a teacher
部分倒装：
将助动词、情态动词、Be动词倒装至主语前
一：hardly、not、seldom等否定词位于句首
Seldom does he go to church
sunday
二：only 引导的状语从句位于句首，要求主倒从不倒
Only when he had done it did he know it was difficult
三：用于和前面句式一致的简短回答，肯定so/否定neithernor，时态、数和前面保持一致
They work hard, so do we
THey never work hard ,neither do we
四：as 引导的让步状语从句，把表语或者状语提前；若表语为单数名词则省略a或an
Child as he is , he knows a lot.
Difficult as it was, I finished it on time.
五：虚拟语气中，从句省略if的倒装
Should she come here, we would disscuss it
六：so……that句型中，so+adj或adv在句首
So carelessly did he drive that he almost killed himself.
七：not only……but also 位于句首
Not only is he a worker but also he is a singer.
