Question

英语选择题中定语从句的先行词怎么判断？

如何判断此题是考宾语从句还是定语从句？

Answer 1

首先明确先行词是什么
先行词是定语从句的引导词前面的名词.在定语从句中充当一定的成分.
被定语从句修饰的名词、代词称为先行词。
我们可以这样认为, 之所以称它为先行词, 是因为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, 而不同于普通形容词修饰名词时, 形容词位于名词之前。
This is the book which I am looking for.中的book是先行词,which是引导词.
He is Mr. Robertson who comes from England. 中的Mr. Robertson.是先行词,who是引导词.
简单的说，就是和修饰宾语的词或从句，词就是先行词

宾语从句中，一定在动词后面有1个句子
I think (it's good)
He can't agree (what he said)

定语从句中，除了非限定性，一定是名词或代词等后面有一个句子
He can't agree the words (he said)
He gave the book (which he borrowed from her) to me.

要区分这两种从句就要看，从句到底是在谓语动词后，还是名词/代词后。
He can't agree (what he said)[接在动词后宾语从句]
He can't agree the words (he said)[接在名词后，定语从句]

Answer 2

I like the idea that we should go back today.
that引导宾语从句，that在后面句子中不做任何成分；idea是宾语

I like the idea that was come up with by Group One yesterday.
that引导定语从句，that在后面句子中作主语；idea是先行词（短语come up with an idea）

Answer 3

宾语从句顾名思义是起到宾语的作用，就是放在介词或者谓语动词的后面。
定语从句的先行词一般是人，物体或者是名词，然后加上引导词
前面一楼回答者第一句是同位语从句，并不是宾语从句。

Answer 4

先行词是名词或代词。后接定语从句。
谓语动词后接宾语从句。
He didn't like the girl who is standing there.（定语从句，先行词是girl)
I don't like what he said.（like后接宾语从句）。