V.-ing 开头的句子，后紧跟单数系动词，后接名词性的词可以判定为倒装。
Playing basketball is an interesting game.(不是倒装)
Playing basketball is my cousin who is from the New York(倒装)
如果我们把第一个句子倒装一下也不会产生歧义，符合英语习惯，因此我们就把单数系动词加名词性的词统统判定为倒装。
例：
Surrounding the column are three sepals and three petals ， sometimes easily recognizable as such ， often distorted into gorgeous ， weird ， but always functional shapes .
Surrounding开头，后接复数系动词可以判定为倒装正常语序为：Three sepals and three petals ， sometimes easily recognizable are surrounding the column.这里倒装的目的是为了平衡句子结构，使对于主语的修饰更加充分
语音朗读：