be in 上下文：But in an old man who has known human joys and sorrows,and has achieved whatever work it was in him to do.我刚学到语法的导学,本来想问一个理论问题：1、如果从句中的that省略了怎么办?却发现这句话,2

be in 上下文：But in an old man who has known human joys and sorrows,and has achieved whatever work it was in him to do.我刚学到语法的导学,本来想问一个理论问题：1、如果从句中的that省略了怎么办?却发现这句话,2
be in
上下文：But in an old man who has known human joys and sorrows,and has achieved whatever work it was in him to do.
我刚学到语法的导学,本来想问一个理论问题：1、如果从句中的that省略了怎么办?
却发现这句话,2、主干应该是it was in

be in 上下文：But in an old man who has known human joys and sorrows,and has achieved whatever work it was in him to do.我刚学到语法的导学,本来想问一个理论问题：1、如果从句中的that省略了怎么办?却发现这句话,2
对于一个懂得了人生的快乐和悲伤,又完成了他内心想做的所有的事情的老人

主语是老人,who has know . and has achieved都是修饰old man

it was in him to do 是修饰work的.可以理解为他应该做的工作.

就个人而言，就个人来说