His father,（who）drove a truck in a factory was hurt in a traffic accident and .His father,（who）drove a truck in a factory was hurt in a traffic accident and had to be in hospital.为什么要加括号里的WORK和括号前的逗号呢?是有
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His father,（who）drove a truck in a factory was hurt in a traffic accident and .His father,（who）drove a truck in a factory was hurt in a traffic accident and had to be in hospital.为什么要加括号里的WORK和括号前的逗号呢?是有
His father,（who）drove a truck in a factory was hurt in a traffic accident and .
His father,（who）drove a truck in a factory was hurt in a traffic accident and had to be in hospital.
为什么要加括号里的WORK和括号前的逗号呢?是有没有它们都可以,还是必须有?为什么?
His father,（who）drove a truck in a factory was hurt in a traffic accident and .His father,（who）drove a truck in a factory was hurt in a traffic accident and had to be in hospital.为什么要加括号里的WORK和括号前的逗号呢?是有
非限性定语从句（作用是对所修饰的成分作进一步说明,将从句拿掉后其他部分仍可成立 ）,通常都用逗号把它和句子的其他部分隔开,做一个特定修饰.
一般定语从句中句子成分完整,而且是that引导的话,则可以省略
如果是有where,when等副词修饰,则不可以省略
里面who一定要有 引导一个从句来描述his father 但是逗号加的有点问题，前面有一个逗号的话，从句的后面也要用逗号跟主干逗开来，逗号加不加其实很主观 但who一定要有
这是一个简单的非限制性定语从句，可以用who直接与前面的连在一起构成普通的定语从句，因此，该句的那个逗号可以不要，没有语法问题，但有些句子不行。
非限制性定语从句（作用是对所修饰的成分作进一步说明，将从句拿掉后其他部分仍可成立 ），通常都用逗号把它和句子的其他部分隔开。关系代词（who）和关系副词在定语从句中一般不能省。
不过括号里一般表示的是可有可无