1.So+连系动词/情态动词/助动词+主语
主谓倒装结构,表示主语和前面所陈述的情况有着相同的肯定概念。其中so代替上文中的动作或 状态，表示“也是这样”、“也是如此”：
①Jack was in Beijing last winter.
Really ? So was I. (=I was also in Beijing last winter. )
②If you go to the seaside for your holiday, so shall I.
-so引导的主句中的连系动词、情态动词或助动词的时态一-般要和前一句中谓语动词的时态一致，但在上面第二例中，前一分句是if引导的条件状语从句，从句中一般现在式谓语动词代表一般将来时， 因此后面so引导的主句要用助动词will或shall.
2.Neither/Nor+连系动词/情态动词/助动词+主语
neither/nor 引 导的结构与so引导的结构一样，但前者是否定，后者是肯定。如:
①I have never been to Macao, neither has my husband.
②It you don't stop to rest, nor will they.
3.比较另外两个结构相似，意义不同的句型。
①主语+do/did/does+so。此句型中do so是替代词，可代替上文中的动宾或动状结构，以免重复。如:
My Chinese teacher told me to hand in my composition on time and I did so.
(=I handed in my composition on time. )
②so+主语+连系动词/情态动词/助动词,这种结构中的主谓是正常语序, so相当于indeed，certainly, 表示说话人对前面或对方所说情况的赞同或证实, 语气较强。如:
-You've dropped a word here.
Yes , so I have.
-You seem to like coffee.
So I do.
--so+主语+助动词，除表示赞同外，有时还带有惊异的意味。
You left your keys at home when you went out.
Good Heavens. So I did.
一你出去的时候把钥匙丢在家里了。
一天哪，可不是吗?
--如果前一分句中有几种不同形式的谓语，后一分句表达相同情况时,不能使用so引起的倒装句，而要用so it is with,或 It is the same with 句型
①She doesn't play the piano, but she likes singing. So it is with my sister.
②Tod's father is an honest man and he works hard; so it's with Tod.
