名词性从句复习名词性从句复习名词性从句是由 if, whether, that 和各种疑问词充当连接词所引导的从句，其功能同名词一样。 一．主语从句一．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 1. It 作形式主语和作形式主语和 itit 引导强调句的比较引导强调句的比较 It 作形式主语代替主语从句，主要是为了平衡句子结构，主语从句的连接词没有变化。而 it 引导的强调句则是对句子某一部分进行强调，无论强调的是什么成分，都可用连词 that 。被强调部分指人是也可用 who/whom 。例如： It is a pity that you didn’t go to see the film. It doesn’t interest me whether you succeed or not. It is in the morning that the murder took place. It is John that broke the window. what 引导主语从句时在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： 1) ______you said yesterday is right. 2) ______she is still alive is a good thing. It is right what you said yesterday.It is a good thing that she is still alive.WhatThat2. what 与 that 在引导主语从句时的区别 二．宾语从句二．宾语从句 宾语从句就是在复合句中作宾语的名词性从句，通常放在主句谓语动词 ( 及物动词 ) 或介词之后。1. 作动词的宾语 (1) 由 that 引导的宾语从句 (that 通常可以省略 ), 例如： I heard that be joined the army. (2) 由 what, whether (if) 引导的宾语从句，例如： She did not know what had happened. I wonder whether you can change this note for me. (3) 动词＋间接宾语＋宾语从句。例如： She told me that she would accept my invitation.2. 作介词的宾语，例如： Our success depends upon how well we can cooperate( 合作） with one another.3. 作形容词的宾语，例如： I am afraid (that) I’ve made a mistake. I am sure (that) he will win the game.4. it 可以作为形式宾语 it 不仅可以作为形式主语，还可以作为形式宾语而真正的宾语 that 从句则放在句尾，特别是在带复合宾语的句子中。 例如： We thought it ...
