He felt weak and sore,and the pain of his smashed knuckles warned him that,even if he could find a job at navvy work,it would be a week before he could grip a pick handle or a shovel.
1.这是一个完整的句子.由两部分构成...and...(并列句),He felt weak and sore,+and+the pain of his smashed knuckles warned him that,even if he could find a job at navvy work,it would be a week before he could grip a pick handle or a shovel.
2.第二分句the pain of his smashed knuckles warned him that,even if he could find a job at navvy work,it would be a week before he could grip a pick handle or a shovel.复杂.the pain of his smashed knuckles warned 主句,him（人） that,even if he could find a job at navvy work,it would be a week before he could grip a pick handle or a shovel（物）.是双宾语结构,that,even if he could find a job at navvy work,it would be a week before he could grip a pick handle or a shovel（物）.是warned的宾语从句,由that（无词意,只是符号）引导.
3.宾语从句that,even if he could find a job at navvy work,it would be a week before he could grip a pick handle or a shovel（物）.由一个复杂句构成,it would be a week before he could grip a pick handle or a shovel（主句),even if he could find a job at navvy work,（从句,由even if引导的让步状语从句）.
4.（主句)it would be a week before he could grip a pick handle or a shovel,为复杂句,before he could grip a pick handle or a shovel（时间状语从句）.
5.could,would都是在假设条件下的虚拟语气陈述.