在英语中，主语和谓语的语序通常的主语在前，谓语在后。但有时为了强调某一部分，或适应一定的语法结构的需要，而把谓语的全部或一部分提到主语的前面，这种情况叫“倒装”(Inversion)。此结构通常只用与一般现在时和一般过去时
倒装的分类
（一）、 全部倒装--主语与谓语动词倒装
结构：谓语动词+主语
Down fell the rain.
（二）、 部分倒装--主语与助动词/情态动词/系动词倒装
结构：助动词/情态动词/系动词+主语+谓语动词
Never have I heard such a thing.
（三）、形式倒装
形式上的倒装在语法上称为前置。它的特点是，只把强调的内容提至句首，主谓并不倒装。
结构：强调的内容+主语+谓语动词
What an interesting talk they had!
The more you listen to English, the easier it becomes.
（一）全部倒装
1. There be 句型(be可换成 live, stand, lie, come, exist, seem, appear 等).
There are so many cars coming and going on the road.
There still exist some problems.
句型 There is no need to do…
There is no doubt that…
There is no knowing\ telling …
2. 在here, there, now, then, thus引导的句子里, 要全部倒装
Here comes your head teacher.
Here he comes.主语是人称代词不用倒装
3.当in, out, down, up, over, away, off, back等副词作状语置于句首时，谓语常用动词有come, go, rush, be, lie, run,等不及物动词。
Up flew the bird.
Out rushed the students.
4.表地点的介词状语位于句首
Under the tree __ sits a beautiful girl, reading. ___
South of the city ___ lies a paper-making plant. ____
Eventually they arrived at a cave, in front of which __ stood a tree. __
5.表语提前
1)表语为介词短语
Among the goods are Christmas trees, flowers, candles and toys.
2)表语为形容词
Present at the meeting were Professor White and many other guests.
3)表语为过去分词
Seated on the ground are a group of young people.
4)表语为进行时态中的现在分词
Lying on the floor was a boy.
Standing beside the desk was a teacher.
Growing along the road are some wild flowers.
6. Such 置于句首时，such和be连用作表语，也常用倒装语序，如：
Such are the facts.
Such a great scientist is Yuan Longping.
此句型中的such 多被认为是表语，所以such后的be动词应与其后的“真正的主语”保持一致。如：
Such are the facts; no one can deny them.
（二）部分倒装
把be/助动词/情态动词 提前到主语的前面
Is am are was were
do does did
can could would may will might 等
1.only所修饰的副词、介词短语或状语从句放在句首时, 要进行部分倒装,如：
Only then did I realize the importance of learning English.
Only in this way can you hope to improve the situation there.
Only after he came back was I able to see him.
注：only修饰主语，仍用自然语序，如：
Only socialism can save China.
使用特点：
（1）在部分倒装句中，如果谓语部分无助动词，则须找助动词来“帮助”它构成倒装句。如：
（F) Only after the war learned he the sad news.
(T) Only after the war did he learn the sad news.
(2) only修饰状语从句时，从句不可倒装。如：
（F) Only when did he return did we find our the truth.
(T) Only when he returned did we find our the truth.
（3）Only 修饰主语时，句子不可倒装。如：
（F) Only can he answer the question.
(T) Only he can answer the question.
2. 否定副词 never ,nor, not, seldom, hardly, little, scarcely, rarely nowhere及表否定意义的介词短语 by no means, at no time, under/in no circumstances, in no case, on no condition等置于句首时 。
如：
I have never seen such a beautiful place.
Never have I seen such a beautiful place.
Not a single mistake did he make= He didn’t make a single mistake
Hardly do I think it possible to finish the job before dark
=I hardly think it possible to finish the job before dark.
3、六个重要的固定句型
（1）… so+be/助动词/情态动词+主语 “……也是如此”
They love having lots of friends; so do I
使用特点：
A. 此句型也可写成“it is the same with….”, 或“so it is with….”.如：
They love having lots of friends; it is the same with those with disabilities/so it is with those with disabilities.
B.如果句意不是 “……也是如此 ”,而仅是对前面内容的肯定或附和（此时的so=indeed),那么，句子不可使用倒装。试比较：
a. I was afraid (句中的I指的是a)
b. So was I (I 指的是b, 此句意为：I was afraid, too)
a. I was afraid （I指的是a)
b. So you were (you 指的也是a。此句意为： Indeed you were afraid.)
(2) …neither (或nor)+ be/助动词/情态动词+主语，“…….也不这样”
Lily can’t ride a bicycle; neither (或nor）can Lucy.
使用特点：
A.此句型也可写成“it is the same with…”，或“so it is with…”
Lily can’t ride; it is the same with Lucy/ so it is with Lucy.
B.此句型中的neither (或nor)不可用so….not 替代，但可用not…either改写。如：
（F) I have never been abroad. So hasn’t he
(T) I have never been abroad. Neither/ Nor has he.
(T) I have never been abroad. He has never/not been abroad, either.
（3）由so\such...that...引导的表示程度的状语从句，将其放于句首表示强调
So +adj./adv. ….that….“ 如此…..以至于…..”。
So clearly does he speak English that he can always make himself understood.
使用特点：
在这个句型中，so 后面的句子要倒装，而that引导的句子不倒装。
（4）Neither…., nor….. “…..不…., …..也不…..”。
Neither do I know it, nor do I care about it.
由于neither 和nor 都是否定词，所以它们后面分句均需倒装。
此类倒装用于重复前句部分内容
前句是肯定句用SO 某人/某事也是
前句是否定句用neither ，nor 某人/某事也不是
倒装句中的谓语应与前句的谓语时态形态一致
（5）Not only…., but also “不仅…..而且….”。
Not only will help be given to people to find jobs, but also medical treatment will be provided for people who need it .
此句型也可写成Not only…but ….或Not only….but….as well的形式，但but (also)引导的句子必须用正常语序。
（6）Not until…. “直到…..才……”。
Not until he returned did we have supper.
使用特点：
A.这句话可以改写成：We didn’t have supper until he returned. 再如：
Not until 4:00 in the morning can he fall asleep.
=He can’t fall asleep until 4:00 in the morning.
B.如果not until 引导的是句子，until从句的主谓不可倒装，只是主句需要倒装。
4、If 虚拟条件从句中. if省略时,had/ were/should等要与主语倒装。从句有(were/should/had)
（1）If I were you, I would work hard.
Were I you, I would work hard.
（2) If it should rain tomorrow, we would put off our meeting.
Should it rain tomorrow, we would put off our meeting.
（3）If he had followed my advice, he would have succeeded.
Had he followed my advice, he would have succeeded.
If it were not for his teacher’s help, he would never graduate from this high school.
Were it not for his teacher’s help, he would never graduate from this high school.
注意：我们可以说Were it not...或者Had it not been..., 但不可以说Weren’ t it... 或者hadn’t it been...
5.在 hardly/scarcely/…when； no sooner…than; not only … but also；so...that; such…that 的倒装句中，前倒后不倒.
hardly/scarcely/ no sooner后句子的谓语用had done, when/than后句子的谓语用一般过去时
(1) Hardly / Scarcely had he fallen asleep when a loud knock at the door awaked him.
(2) No sooner had I reached the station than train moved.
(3) Not only is he interested in football but also he plays it well.
So hard does he work that he has made great progress in English.
6.在以often, always, once, many a time, now and then,等作状语的频度副词位于句首时。
Often did I speak of him before.
Many a time has he helped me with my experiment.
(三）形式倒装
形式上的倒装在语法上称为前置。它的特点是，只把强调的内容提至句首，主谓并不倒装。这样的结构非常多，但有几个重要的句型需要特别注意：
1、感叹句
What an interesting talk they had!
How interesting their talk is !
使用特点：
对名词（或中心词是名词）感叹时，用what引导；对形容词或副词感叹时，用how引导。
2、the more…..the more….句型
The more you listen to English, the easier it becomes.
使用特点：
（1）此句型中的more代表的是形容词或副词的比较级，要灵活使用。
The harder you work, the greater progress you will make.
（2）此句型中的第一个the more 引导的部分相当于一个条件状语从句；第二个the more引导的部分相当于一个主句。所以，上面例句的意思实质上就是： If you work harder, you will make greater progress.
3、whatever/however引导的让步状语从句
However difficult the problem may be, we must work it out this evening.
使用特点：
Whatever 后面常接名词；用however时常构成以下形式：
However+形容词/副词+主语+…..
Whatever reasons you have, you should carry out your promise.
4、as, though引导让步状语从句时采用倒装形式的情况
名词\形容词\副词\分词+as\though+主语+其他
动词原形+as/though+主语+情态动词/助动词
（1）表语的倒装
Tired as/though he was, he still went on with his work.
Strange as/ though it seems, it is true
Exhausted as/ though she was, she wasn’t able to sleep.
Child as he is, he has to make a living
注意：从句的表语是名词，其名词前不加任何冠词
（2）谓语动词的倒装
Try as he might, he didn’t pass the exam.
Search as they would here and there, they could find nothing in the room.
（3) 状语的倒装
Much as he likes the bike, he doesn’t want to buy it .
Hard as I studied, I could not catch up with them.
（4）分词的倒装
Surrounded though he was by the enemy, he was not afraid.
注意：如果是单数名词或形容词的最高级作表语，不再用冠词。如：
Youngest as he is in our class, he speaks English the best.
5、 祝愿语
May you succeed!
May you be happy!
May peace return to the troubled land!
Long live the People’s Republic of China!
其他情况
直接引语的全部或一部分放在句首时，主句中的主谓也常直接倒装。
“Very well,” said the French student.
“Bring me two eggs and a cup of tea, please.” added the customer.
参考资料：中学英语教育资源网