倒装句就是把句子的谓语或者是谓语的一部分放到句子主语的前面，这样的语序就是倒装句。
在一般疑问句中出现，例如Doeshe play the guitar well？
Only后接副词或或介词短语或状语从句放在句首时Onlythen did I realize that I was wrong.
含有否定意义的副词或连词放在句首时Hardlyhad I arrived when I had a new problem to cope with.
So放在句首时Sheis a teacher.so is her mother.
虚拟语气中省略if的条件句中Hadyou come earlier, you would have seen him.
Neither,nor放在句首时
Ihave never been abroad. Neither has he.
Heseldom goes to the cinema. Nor do I.