主语从句的用法 主语从句如何使用

发布时间:2017-05-06 12:47

主语从句即在复合句中充当主语成分的句子,那么你对主语从句的使用方法了解多少呢?以下是由小编整理关于主语从句的用法的内容,希望大家喜欢!

主语从句的用法 主语从句如何使用

主语从句的用法

主语从句 定义:在句子中担当主语的是一个从句,这个从句就叫做主语从句。

主语从句是在复合句中充当主语的从句,通常放在主句谓语动词之前或由形式主语it代替,而本身放在句子末尾。

1. It 作形式主语和it引导强调句的比较

①主语从句常用it作形式主语,一般常用句型为:It is+{名词/形容词/过去分词}+主语从句例如:

It is still a question whether she will come or not.

It is strange that you should like him.

It is still unknown which team will win the match.

另外,还有一些比较多见的结构:

It turned out that……;

It has been proved that……;

It happened/occurred that……;

It is well-known that……等等

②而强调句则不同,它的结构是:It+be+被强调部分+that+从句

强调主语:It is the times that produce their heroes.时势造英雄

强调宾语:It is English that Prof.Lin teaches us.

强调状语:It was in shanghai that I saw the film.

判断是否是强调句有一个方法,就是将that以后的“句子的其余部分”拿出来单独看,看有没有缺成分,缺的是什么成分,再把谓语动词后面that前面的那部分,带到你认为缺成分的地方,如果放进去是一句完整的句子了,那就说明是强调句。

2. 用it 作形式主语的结构

(1) It is +名词+that从句

It is a fact that … 事实是……

It is an honor that …非常荣幸

It is common knowledge that …是常识

(2) it is +形容词+that从句

It is natural that… 很自然……

It is strange that… 奇怪的是……

(3) it +不及物动词+that从句

It seems that… 似乎……

It happened that… 碰巧……

(4) it is+过去分词+that从句

It is reported that… 据报道……

It has been proved that… 已证实……

3.主语从句不可位于句首的五种情况

(1) if引导的主语从句不可居于复合句句首。

(2) It is said , (reported) …结构中的主语从句不可提前。例如:

It is said that President Jingo will visit our school next week.

(3) It happens…, It occurs… 结构中的主语从句不可提前。例如:

It occurred to him that he failed in the examination.

(4) It doesn’t matter how/whether …结构中的主语从句不可提前。例如:

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

(5) 含主语从句的复合句是疑问句时,主语从句不可提前。例如:

Is it likely that it will rain in the evening?

4. What 与that 在引导主语从句时的区别

What 引导主语从句时在从句中充当句子成分,如主语.宾语.表语,而that 则不然。例如:

What you said yesterday is right.

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