请各位老师帮我解决一下下面的句子,学生感激不尽.

题目

请各位老师帮我解决一下下面的句子,学生感激不尽.
（All that a man has to say or do that can possibly concern mankind）,is in some shape or other to tell the story of his love - to sing,and if he is fortunate and keeps alive,he will be forever in love我想问一下,我所括号里面的这两个that中,第二个that是启啥作用的呢?

答案

All that a man has to say or do that can possibly concern mankind显然,第一个that与all一起构成主语,a man has to say or do that can possibly concern mankind作定语,第二个that也引导定语从句,用来修饰说明前...