英语语法中倒装句是不可缺少的句型之一。定义为了强调、突出等语的目的而颠倒原有语序的句式叫做倒装句。在倒装句中，颠倒了的成分可以恢复原位而句意基本不变，句法成分不变。
as,though引导的倒装句
as/though引导的让步从句必须将表语或状语提前(形容词,副词,分词,实义动词提前)。
注意
1)句首名词不能带任何冠词。
2)句首是实义动词,其他助动词放在主语后。如果实义动词有宾语和状语,随实义动词一起放在主语之前。
Try hard she will,he never seems able todo the work sati sfactorily.
注意
让步状语从句中，有though，although时，后面的主句不能有but，但是though和yet可连用
only在句首要倒装的情况
以only修饰的副词、介词短语或者从句做状语放在句首时，用部分倒装。
Onlyinthisway,canyoulearnEnglishwell.
如果句子为主从复合句，则主句倒装，从句不倒装
Only when he is seriousl yill,does he evers tayin bed.
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