had better表示最好：
　　had better 相当于一个助动词，它只有一种形式，它后面要跟动词原形。
　　had better do sth
　　had better not do sth
　　It is pretty cold. You'd better put on my coat.
　　She'd better not play with the dog.
　　had better have done sth表示与事实相反的结果，意为"本来最好"。

so,neither,nor作部分倒装：
　　表示"也"、"也不" 的句子要部分倒装。　　
　　Tom can speak French. So can Jack.
　　If you won't go, neither will I.
　　典型例题
　　---Do you know Jim quarrelled with his brother?
　　---I don't know, _____.
　　A. nor don't I care　　B. nor do I care　　C. I don't care neither　　D. I don't care also
　　答案：B. nor为增补意思"也不关心"，因此句子应倒装。A错在用 don't 再次否定，C neither 用法不对且缺乏连词。 D缺乏连词。
　　注意： 当so引出的句子用以对上文内容加以证实或肯定时，不可用倒装结构。意为"的确如此"。
　　Tom asked me to go to play football and so I did.
　　---It's raining hard.　　　---So it is.