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全部倒装的情况有以下三种：
(1)以here, there, up, down, in, off, away, then 等副词开头的句子，要进行全部倒装，但主语不能是代词。(提供记忆口诀：这里、那里、上上、下下，这时、那时、里里、外外)
如：Here comes the bus!
In came the teacher, but out he went again. (前半句是副词in开头，因此全部倒装，而后半句作主语的是人称代词he，所以不全部倒装。)
(2)表示地点的介词短语作状语放句首时，全部倒装。
如：Under the tree stands a beautiful girl.
(3)强调表语，放句首时，为了保持句子的平衡，全部倒装。
如：Present at the meeting were 1000 students.
部分倒装的情况比较多，为了记忆方便，我总结了以下常考的三点：
(1)前倒后不倒：
① never, hardly(…when…), scarcely, seldom, little, not, no sooner...than…, nor…等含有否定意义或否定形式的副词放句首时，要前倒后不倒;
如： Hardly had I picked up the phone when I was told that the hotel had been booked full.
② not only…but also…连接并列的句子放句首时要前倒后不倒;
如：Not only does he know French, but also he is expert at it.
③ So… that …, such… that …中So或者such及修饰的成分放句首时，前倒后不倒。
如：So busy is he that he cannot go on a holiday.
(2)前不倒后倒：
only +状语/in this way 放句首;not until+时间状语放于句首时，前不倒后倒;
如：only after he has finished his homework is he allowed to go to the party.
Not until he came back from the troop did he meet his fiancée.
(3)前后都倒： neither… nor…连接并列的句子放句首时，前后都倒装。
如：Neither do I know it, nor do I care about it.
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