so做程度副词或者指示代词用时，它如果提前放在句首，句子需要部分倒装，也就是把be动词、助动词或情态动词放在主语的前面，如果是一般动词，则要在主语前面加助动词do、does、did。
一、部分倒装的定义。
英语中有两种倒装形式，一种叫做完全倒装，一种叫做部分倒装。
部分倒装是只把助动词、情态动词、be动词放在主语的前面，如果是一般动词，则要在主语前面加助动词do、does、did。
二、部分倒装的使用。
表示否定的字放在句首。
Never is he late for school.
Rarely does he tell a joke.
Never have I seen such beautiful scenery.
Under no circumstances will China use nuclear weapons first.
Not only does he draw illustrations, but also he writes novels.
No sooner had he reached his house than it began to rain.
Hardly had I sat in the chair when someone knocked at the door.
Not until I talked to him, did I know he was homesick.
I haven't visited the North Pole, nor do I plan to.
If you don't go, neither will I.
No hope did I have at that time.
Not a word did my father say.
only加状语放在句首。
Only in case of emergency can we use this exit.
Only when it rains, do you feel cool.
Only if you become a college student, will I accept you as a friend.
Only in direct communication, is there mutual activity.
程度副词放在句首。
Well do I remember the promise you made last year.
Such a boring lecture was it that half the students fell asleep.
指示代词so放在句首。
I often donate money to charity, and so does my wife.
He can play the piano, and so can I.
I am good at Spanish, and so is she.
注意下面的句子：
The greatest gift we have is our health, and so it is.
I often donate money to charity, and so I do.
So + 形容词 + be/V + 主词 + that + 句子
so +助动词+主语,这种结构表示 主语也这样.
so +主语+助动词,表示是的,他们是.是对前半句的再次肯定.
为强调事物的特征.
例如：
[表示方式,方法,情况等]那么,那样; 这么,这样
Hold the pen so.
这样执笔.
You must not do so.
你一定不要那么做.
[表示程度]到那个程度,那样,如此地
so important an event
这么重要的一件事 追答
以特殊副词only和so开头的倒装句（2）
以so开头的so...that...句型的倒装句
公式：so+形容词或副词+一般疑问句+that+陈述句
He studied so hard that he got the first prize.（正常句型）
So hard did he study that he got the first prize.（倒装句型）
他学习如此努力以至于得了第一名。
The film is so interesting that everybody likes it very much.（正常句型）
So interesting is the film that everybody likes it very much.（倒装句型）
这部电影是如此有趣以至于每个人都很喜欢它
这种是考试常考的，找个例句背得烂熟于心就行。
追问嗯嗯，谢谢
倒装后→So frightened she was