主语从句是什么意思
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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。
一、用法
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.
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
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.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.
二:宾语从句
引导词:
what\which\whose\when\whether\if\where
宾语从句的引导词、连接词的区别、否定转移等现象。名词性从句的语序永远是陈述句。