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部分倒装是指将谓语的一部分如助动词或情态倒装至主语之前。如果句子的谓语没有助动词或情态动词，则需添加助动词do, does或did，并将其置于主语之前。
1.句首为否定或半否定的词语。
如no, not, never, seldom, little, hardly, scarcely, at no time决不, by no means, on no account, in no case, many a time, under no circumstances, in no way, many a time, not until… 等。例如：
Never have I seen such a performance. 从未见过如此糟糕的表演。
Nowhere will you find the answer to this question. 无论如何你不会找到这个问题的答案的。
Not until the child fell asleep did the mother leave the room. 母亲一直到孩子入睡后离开房间。
当Not until引出主从复合句，主句倒装，从句不倒装。即：后倒前不倒。注意： 如否定词不在句首不倒装。例如：
I have never seen such a performance.
---never have I seen such a performance.
The mother didn't leave the room until the child fell asleep.
---not until the child fell asleep the mother did leave the room.
2．以否定连词开头作部分倒装
如 Not only…but also, Hardly/Scarcely…when, No sooner… than等，前倒后不倒。例如：
Not only did he refuse the gift, he also severely criticized the sender. 他没有收下礼物，还狠狠批评了送礼的人。
Hardly had she gone out when a student came to visit her. 她刚出门，就有个学生来访。
No sooner had she gone out than a student came to visit her. 她刚出门，就有个学生来访。
3． so, neither, nor作部分倒装。
表示另一主语“也…样”时，用“So + be(have,助动词或情态动词)+主语”结构；而表示另一主语“也不…样”时，用“Nor\Neither + be(have,助动词或情态动词)+主语”结构。例如：
Tom can speak French. So can Jack. 汤姆会讲法语，杰克也会。
If you won't go, neither will I. 你不去，我也不去。
4．only在句首倒装的情况。only+副词；或介词短语；或状语从句时，主句倒装。例如：
Only in this way, can you learn English well. 只有这样，你才能学好英语。（only+介词短语）
Only after being asked three times did he come to the meeting. 叫了三次，他才来参加会议。
Only yesterday did he find out that his watch was missing.（only+副词）
Only when it began to rain did he finish his job.（only+状语从句）
如果句子为主从复合句，则主句倒装，从句不倒装。例如：
Only when he is seriously ill does he ever stay in bed. 病得狠重时，他才卧床休息。
祝学习愉快！