什么是倒装句?

倒装句用法
1.为强调句中的某一部分或为句子结构的需要将一般陈述句的助动词或动词放在主语之前的句子是倒装句。
Hardly had I any time to finish it.
我几乎没有时间完成。
2.否定副词如hardly，never等在句首。
Only by boat can you go there.
只有坐船你才可以到那里。
3.only在句首。
Many times have I heard her sing.
好多次我听到她唱歌。
4.频率副词在句首。
Were she my sister, I would not let her go.
假如她是我妹妹，我不会让她走。
5.虚拟语气省略if。
There is a football match on TV, isn't there?
电视上有一场足球比赛，不是吗？
6.there be句型中。
There were some students in the classroom just now.
刚才教室里有一些学生。
7.there be句型中。