分词结构转换Afterwasarrested,themanadmitedhidingintheboxbeforetheplaneleftLondon.=Afterbeingarrested,themanadmitedhidingintheboxbeforetheplaneleftLondon.=Afterhavingbeenarrested,themanadmitedhidingintheboxbef

Question

分词结构转换
After was arrested,the man admited hiding in the box before the plane left London.
=After being arrested,the man admited hiding in the box before the plane left London.
=After having been arrested,the man admited hiding in the box before the plane left London.
=Having been arrested,the man admited hiding in the box before the plane left London.
我用这三种形式转换,
这个是现在分词完成时形式作状语,
第一句是书本上的答案。
另外，分词结构转换的时候，为什么有时候要省略关系代词，有时候可以不省略？

Answer 1

说实话,第二句听起来别扭.第三句是状语.如果不是必须要用这个格式的话,还可以说：After his arrest,the man admited hiding in the box before the plane left London.如果这没有新概念里的上下文的话,还可以缩成 The arrested man admited hiding in the box before the plane left London.
“另外,分词结构转换的时候,为什么有时候要省略关系代词,有时候可以不省略?”
举个例子.