传说中有个神秘的现象，就是定语从句有“限定性”和“非限定性”之分，很多同学尝试了很多次去辨别二者有啥不同，结果越辩越晕....

　　今天我们就再做最后一次努力，保证让大家记住二者的差别!

　　先看个句子：

　　Rather, in their day-by-day tactical maneuvers, these senior executives rely on what is vaguely termed "intuition" to manage a network of interrelated problems that require them to deal with ambiguity, inconsistency, novelty, and surprise; and to integrate action into the process of thinking.

　　用我们之前说过的方法，先试着找主干：

　　these senior executives rely on sth to manage … (that…) and to integrate …

　　上面句子中有个that从句修饰前面的名词problems。这就是限定的。

　　再看一个句子：

　　However, the Women's Trade Union League (WTUL), which had ceased in the late 1880s to oppose restrictions on women's labor, supported the eventually enacted proposal, in part because safety regulations were generally not being enforced in white lead factories, where there were no unions (and little prospect of any) to pressure employers to comply with safety regulations.

　　同样找主干：

　　WTUL, (which…), supported the proposal, (because…), (where…)

　　这个句子中有两个从句在修饰前面的名词，一个是which修饰WTUL，一个是where修饰white lead factories。这两个都是非限定的。

　　这几个从句有什么不一样呢?

　　我想说的是，不都是在修饰前面的名词吗?有什么区别?没有区别!!

　　唯一的区别就是，第二句中的两个定从，都有逗号隔开，读句子主干一遇到逗号就跳过，直接忽略它们了，但是第一个句子中的that没有逗号分开，我还得找一下它的开头结尾，再把它跳过去。。。

　　所以也有语法家——我说，能被忽略的，都是不需要的，不能被忽略的，都是需要的。。。

　　总结：

　　都是定从，都修饰前面名词，它们是没有区别的!

　　如果非要加个区别，那就是“, which”可以直接扔掉，而“that”不能直接扔掉。仅此而已!

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