had better表示最好：
　　had better 相當于一個助動詞，它只有一種形式，它后面要跟動詞原形。
　　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表示與事實相反的結果，意為"本來最好"。

so,neither,nor作部分倒裝：
　　表示"也"、"也不" 的句子要部分倒裝。　　
　　Tom can speak French. So can Jack.
　　If you won't go, neither will I.
　　典型例題
　　---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為增補意思"也不關心"，因此句子應倒裝。A錯在用 don't 再次否定，C neither 用法不對且缺乏連詞。 D缺乏連詞。
　　注意： 當so引出的句子用以對上文內容加以證實或肯定時，不可用倒裝結構。意為"的確如此"。
　　Tom asked me to go to play football and so I did.
　　---It's raining hard.　　　---So it is.