通过高考题精讲why引导的宾语从句

语法对点讲练五 名词性从句

名词性从句的功能相当于名词词组，能在句中充当主语、宾语、表语、同位语、介词宾语等。因此名词性从句又分为主语从句、宾语从句、表语从句和同位语从句。

引导词归类：

类别 功能 引导词

从属连词 只起连接作用，不充当句子成分 that, whether, if

连接代词 起连接作用，并充当主语、宾语、表语或定语 who, whom, whose, which, what,

whatever, whichever, whoever

连接副词 起连接作用，并充当从句状语 when, where, how, why

一、主语从句

学问点讲解

1．主语从句的一般结构

①主语从句一般放于主句谓语动词前，构成：主语从句＋谓语动词＋其他。

2．it作形式主语的主语从句

②It＋be/become(s)＋形容词/名词/过去分词＋主语从句。

It is clear that the whale is not a fish.

③It seems/appears等动词＋that从句。

It happens that he can understand a little about the language.

④It remains to be＋过去分词＋主语从句。

⑤It doesn't matter＋how/whether从句。

It doesn't matter whether he is wrong or not.

⑥主语从句毁灭在感叹句中。

What a pity it is that you cannot stay for dinner.

特殊提示

⑦用来表示惊异、怀疑、惋惜、理应如此等语气时，主语从句谓语动词用(should＋) do形式。常用句型有： It is necessary/important/natural/strange等＋that从句

It is suggested/requested/proposed/desired等＋that从句

考点20

主语、表语和同位语从句

高考频度：★★★★★

考向二 主语从句

1.主语从句在复合句中充当主语，大多数主语从句都可以用it作形式主语而把主语从句置于句尾。

2.that引导主语从句时可用it作形式主语，that不可省；what引导的主语从句表示＂……的东西＂时，一般不用it作形式主语；whatever，whoever，whichever一般也不用it作形式主语。

☞That she will succeed is certain.

☞It is certain that she will succeed.

注意：(1)在＂It is necessary/important/strange/natural...＋that从句＂结构中，从句谓语常用＂(should＋)动词原形＂形式。

【拓展延伸】主语从句的引导词 常见的it替代that引导的主语从句的句式主要有以下几种：

(1)It＋系动词＋形容词(necessary，right，likely，unlikely，wrong，important，certain，clear，obvious，strange，normal等)＋that从句

☞It is certain that most of the farmers have brought in more money by all means.

(2)It＋be＋名词(短语)(a pity，a shame，good news，a fact，an honour，a wonder，no wonder等)＋that从句

It’s no wonder that you’ve achieved so much success.

(3)It＋be＋过去分词(said，told，heard，reported，decided，suggested，advised，ordered，remembered，thought，considered，well­known，announced等)＋that从句

2023年高中英语语法名词性从句精讲之：四大从句用法大全

主语从句

主语从句的概念：

如果一个句子在复合句中充当一个主语，那么这个句子就是主语从句。主语从句通常由从属连词that，whether，if和连接代词what，who，which whatever，whoever以及连接副词how，when，where，why等词引导。that在句中无词义，只起连接作用。

主语从句用法：

1、主语从句的引导词：

主语从句通常由连词that和whether、连接代词或连接副词以及关系代词型what引导：

如：That he is still alive is a wonder.

他还活着，真是奇迹。

When we arrive doesn't matter. 什么时候到没有关系。

What we need is money. 我们需要的是钱。

What I want to know is this. 我想知道的就是这一点。

Whether they would support us was a problem.

他们是否会支持我们还是一个问题。

2、主语从句与形式主语it： 有时为了考虑句子平衡，通常在主语从句处使用形式主语it，而将真正的主语从句移至句末。这分三种情况：

(1)对于以连词that引导的主语从句，通常用形式主语代主语从句：

如：It's a pity that he didn't come. 很遗憾他没来。

(2)对于以连接代词(副词)引导的主语从句，可以使用形式主语代主语从句，也可直接在句首使用主语从句：

如：Whether they would support us was a problem.

他们是否会支持我们还是一个问题。

It was a problem whether they would support us.

专题十 名词性从句

A组 三年模拟精选(2015～2013)(改编)

1.(2015·辽宁鞍山联考)One day，he came up with an idea he would pluck

up all of his crop a few inches.

解析 考查同位语从句的引导词。因后面是一个完整的句子，且该句是说明空格前面an

idea的具体内容，所以是同位语从句。从句结构完整，故要用that引导。

答案 that

2.(2015·广西南宁二中月考) is important is that we let others know we

care about them.

解析 考查主语从句的引导词。根据句子结构可知，系动词is前的句子缺少主语，表示“重要的事情”要用what。

答案 What

3.(2015·内蒙古师大附中月考)Over the next several months，my professor taught me

one story was so much better than the other.

解析 考查宾语从句的引导词。教授教给我的是为什么一个故事比另一个更好。根据句意可知此处要用why引导宾语从句。

答案 why

4.(2015·河南开封四模)A study found girls who ate five or more family

meals a week had a much healthier relationship with food in later life.

解析 考查宾语从句的引导词。谓语动词found后为宾语从句，宾语从句中不缺少成分，故要用that引导。

答案 that

5.(2015·四川成都七中二诊)Perhaps my mother had told me was deeply