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部分倒装的几种情况：句首为否定或半否定的词语，如no，not，never，seldom，little，hardly，at no time，in no way，not until；否定词开头作部分倒装等。
部分倒装
1）句首为否定或半否定的词语
如no，not，never，seldom，little，hardly，at no time，in no way，not until等。
Never have I seen such a performance.
Not until the child fell asleep did the mother leave the room.
当Not until引出主从复合句，主句倒装，从句不倒装。注意：如否定词不在句首不倒装。比如：I have never seen such a performance.
The mother didn't leave the room until the child fell asleep.
2）否定词开头作部分倒装
如 Not only…but also, Hardly/Scarcely…when, No sooner… than等，要倒装。例如：
Not only did he refuse the gift, he also severely criticized the sender.
Hardly had she gone out when a student came to visit her.
No sooner had she gone out than a student came to visit her.
3）so，neither，nor作部分倒装
用这些词表示"也"、"也不" 的句子要部分倒装。例如：
Tom can speak French. So can Jack.
If you won't go, neither will I.
4）only+副词/介词/状语从句位于句首，要部分倒装
Only in this way, can you learn English well.
Only after being asked three times did he come to the meeting.
如果句子为主从复合句，则主句倒装，从句不倒装。
Only when he is seriously ill does he ever stay in bed.
5）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）。但需注意：
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。例如：
Try hard as he will, he never seems able to do the work satisfactorily.
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。
6)其他部分倒装
1）so…that句型中的so 位于句首时，需倒装。例如：
So frightened was he that he did not dare to move an inch.
2）在某些表示祝愿的句型中。例如：
May you all be happy. 愿你们都快乐。
3）在虚拟语气条件句中从句谓语动词有were，had，should等词，可将if省略，把were，had，should移到主语之前，采取部分倒装。例如：
Were I you, I would try it again. 我是你的话，就再试一次。