Only then did I realize the importance of math. (副词)
Only when the war was over in 1918 was he able to get happily back to work. (从句)
注意：① 在only＋状语从句＋主句结构中，主句倒装， 但从句用正常语序。
Grammar
Inversion
英语句子的自然顺序是主语在前,谓语在后（主语+谓 语）。把谓语动词放在主语之前（谓语+主语）,就叫 倒装结构。如果全部谓语放在主语之前, 叫全部倒装; 如果只把助动词或be 动词放在主语之前就叫部分倒 装。
基本语序（natural order）：
主语+谓语+宾语（subject + predicate+ object）
He looked. He was able to look. He had looked. He looks. He can do that. He is handsome. He does those things. He hadn’t finished.
一、完全倒装
1. There be结构。另外,在此结构中可以用 来代替be动词的动词有:exist, seem, happen, appear, live, rise, stand等。
注意：①not only置于句首②but(also)部分不倒装，
1) Hardly ____ the airport when the plane took
off.
A. I had arrived at B. had I arrived
C. had I reached
D. I had got to
注意：从句的表语是名词，其名词前不加任何 冠词
6.用于So/neither (nor) + be ( have, 助动词或情 态动词) + 主语+其他的句子
表示两人的同样一个情况时，只能表示一件事，即 上、下句所使用的动词、时态要一致。否则要用so it is with…/It is the same with…
注意：在上述句子中，如果主语为人称代词，
则主、谓不需要倒装。 In he came and back he went again.
4."分词(代词) + be + 主语"结构。
Walking at the head of the line was our teacher. Such was the story he told me.
I love English.
完全倒装 (full inversion) 谓语+主语
Here came the headmaster.
部分倒装 (partial inversion)
助动词/情态动词+ 主语 + 动词
Nerve will I forgive you.
1. The bell goes there. 2. The children rush out. 3. A small garden was in front of the house .
4. "Not only + 分句,but also + 分句"句型 中的前一分句要部分倒装。
但not only...but also...连接主语时,不倒装。 如: Not only the mother but also the children are sick.
如： ___ himself wrong, but his friends were wrong.
5. 为了保持句子结构平衡, 或为了强调 表语或状语,或为了使上下文结构紧凑。 They arrived at a farmhouse, in front of which sat a small boy.
强调状语
Inside the pyramids are the burial rooms for the kings and queens and long passages to these rooms.
句式： “否定词/词组＋助动词/情态动词/be动词＋主语＋ 其他”。
Not until+从句/时间状语+主句（部分倒装）。
No sooner had sb done than…；Hardly/scarcely
had sb done when…
刚刚…就
Not only+分句（部分倒装）but also+分句（不倒装）
(2). 表示方向的副词out, in, up, down等 置于句首,要用全部倒装。如果主语是人称代 词,就不用倒装。如:
In came Mr. White. Up went the arrow into the air. Away went the boy.
题：There ________. And here ________. A. goes the phone; she comes B. is the phone going; is she C. does the phone go; does she come D. the phone goes; come she
B. There stands; under
C. Stands there; under D. There stands; at
2 ，(1).在以here、there、now、then等 副词开头的句子里。
句式：副词＋vi＋名词主语
“Here, There, Now, Then + come (或be,go,lie,run) + 主语" 结构。
3.当表示地点的介词词组(如on the wall, under the tree, in front of the house, in the middle of the room等)在句首时。
句式：介词短语＋vi＋主语（必须是名词）
如：At the foot of the hill lies a beautiful lake. East of the lake lie two towns. Under the tree was lying a wounded soldier.
2)表语为形容词
Present at the meeting were Mr 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.
Here comes the old lady! Then came the hour we had been looking forward to. Now comes your turn.
如果主语是人称代词,主语和谓语语序不变，不用倒装。
如:Here you are. There she comes.
There stood a dog before him. There exist different opinions on this question.
例题:
________ a beautiful palace ________ the foot of
the hill.
A. There stand; at
②only修饰主语，不倒装。
3. so或so引导的短语放在句首,前半部分倒装。
I saw the film, so did she. So loudly did he speak that even people in the next room could hear him.
1) The doctor told Charlie to breathe deeply and ____. A. so did Charlie B. Charlie did so C. Charlie does so D. did Charlie so
如：I have never been to Guangzhou University, neither/ nor has he.
题：________, a man of achievements, deep thoughts,
but with simple habits.
A. Einstein was such B. Such was Einstein
C. Einstein was so D. So was Einstein
保持句子be动词、情态动词、助动 词放到主语之前。如果句子中没有这些词, 要在主语之前加助动词do / does / did等, 而把原来的谓语动词变成原形放在主语之后。
1. 句首状语为否定词或半否定词的句子。
这类词或短语主要有never, neither, nor, little, seldom(很少，不常）, rarely（很少，罕有）, hardly, scarcely（几乎不，简直没有）, no sooner（立即）, by no means（决不） ，not only, in no way（决 不）, at no time, few, not, no等,
He has been to Beijing. So have I. Tom can’t answer the question. Neither /Nor can I .
So +be/助动词/情态动词+主语 某人也是如此 Nor/neither +be/助动词/情态动词+主语 某人也不是如此 So +主语+be/助动词/情态动词 某人确实如此