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 danger.      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 highest scores on the final exam.   =He worked so diligently that he got highest scores on the final exam.    Such was his wish that the world would stay away from war forever.  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.疑问倒装疑问句需部分倒装语序,由于经常用到不会成为考试的难点.如：What part did he play in Hamlet?      Do you prefer tea or coffee?