怎样判断定语从句中先行词？

先行词是名词或代词,如果名词或代词后面有修饰它们的句子且它们在句中充当某一成分,它们就是先行词.
把先行词还原到从句中,就能判断做什么成份.
如:I will never forget the day when I first went to school.(先行词是day)
从句=I first went to school on the day.
(on the day 在从句中作状语=when)

I will never forget the day that was very special to me.(先行词是day)
从句=The day was very special to me
(the day 在从句中作主语=that/which)。

先行词是被定语从句所修饰的名词、代词；在定语从句中充当一定的部分：

1，修饰它的定语从句总是放在它之后，先行词总是出现在定语从句之前；

2，普通形容词修饰名词时，形容词位于名词之前。

例如：

1，his is the book which I am looking for.
它是我正在寻找的书。
其中的“the book”是先行词，“which”是引导词；

2，He is Mr. Robertson who comes from England.

他是来自英国的罗伯森先生。
其中的“Mr. Robertson”是先行词，“who”是引导词,；

3，Was that a singer that sang Xi Yangyang？
那个是唱喜洋洋的歌手吗？

其中的“a singer”是先行词，“that”是引导词。

先行词是名词或代词,如果名词或代词后面有修饰它们的句子且它们在句中充当某一成分,它们就是先行词.
把先行词还原到从句中,就能判断做什么成份.
如:I will never forget the day when I first went to school.(先行词是day)
从句=I first went to school on the day.
(on the day 在从句中作状语=when)

I will never forget the day that was very special to me.(先行词是day)
从句=The day was very special to me
(the day 在从句中作主语=that/which)
摘自： __zyy_我爱你