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主语从句的位置情况及用it作形式主语的结构

分类: 英语语法 

主语从句有个特殊的用法,即it可作形式主语,一般用在主语较复杂的情况下,另外,主语从句在几种情况下不可以放在句首,下面,小编将给大家一一讲解相关的语法知识,一起来看看吧!

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……

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?

这五种情况,大家在今后的学习中要时刻注意,多思考才能不犯同样的错误。赶快收藏起来吧~

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