副词提至句首引起倒装，可分以下几种情况：

1. only + 副词(when，before，if，after等)或only+介词状语(由in，under，by，on，after等引导)提前，必须部分倒装
如：Only then did he realize how stupid he had been. Only after entering the store did Arthur realize that there was dan ger.
Only in the library can she concentrate on her study.

2. often，such，so等副词提前，部分倒装
如：So diligently did he work that he got hight scores on the final exam. =He worked so diligently that he got hight scores on the final exam.
Such was his wish that the world would stay away from war forever.

Often did we go on a holiday in hot summer.

注意，so的另一种倒装是表示“也…”
California relies heavily on income from crops, and so does Florida. 加利福尼亚过多的依赖于来自农作物的收入，佛罗里达也是这样同理，体会一下neither， nor的倒装 He can‘t dance, neither/nor can I.= I can’t, either.
他不会跳舞，我也不会。

3. in，out，down，up，away，off，here，there，over等副词提前，全部倒装
如：Off got the staggering gentlemen.
Here are the photos I took at the seaside.