Question

And that is the reason why when youth is gone,every man will look back upon that period of his life

<接上句。》with infinite sorrow and regret. 有谁可以帮我分析下这个句子。好长啊。谢谢啦 ，

Answer 1

that is the reason 主干句子，结构是主系表，that主语,is系动词作谓语，the reason是表语
why ..到最后是从句，同位语从句（名词性从句的一种），先行词是the reason，即是理由的具体内容，什么理由
从句里又有一个时间状语从句，when引导
看时间状语从句哦，从句是when youth is gone 当青春过去时，主句是every man will look back upon that period of his life with infinite sorrow and regret. 结构是- 主语every man，will look back upon 谓语（动词短语）,that period of his life是宾语（回头看的对象，看什么），with infinite sorrow and regret 用...的情感，作方式状语（怎么看的）

整个句子的意思：而那就是为什么每个人在青春过去（就是不再年轻）的时候，都会充满着无限悲伤和遗憾的心情回顾他的整个人生的原因。

Answer 2

And that is the reason why, when youth is gone, every man will look back upon that period of his life with infinite sorrow and regret. It