英语句法疑问

题目

英语句法疑问
The little sleep I had to function on also contributed to this being the greatest test of my life.
（译文：我每天只能睡一小会儿觉,这一切使实习医生的岁月成为我人生中最严峻的考验.）
请问此英语句子的语法结构是怎样的?我不太能理解,请帮忙分析一下,谢谢~

答案

句子的主语是The little sleep, I had to function on 是修饰The little sleep的定语从句,省略了引导词which/that, contributed to 是动词短语充当谓语, this being the great test of my life是动名词短语作宾语...