高中英语三大从句讲解

复合句 【语法要点】 复合句是由一个主句加一个或几个从句所构成的句子。从句只用作句子的一个成分，不能独立。根据从句在句子中的作用，可分为名词性从句、定语从句和状语从句三类。 （一）名词性从句 名词性从句包括主语从句、表语从句、宾语从句、同位语从句。其关联词有连接词that、if、whether；疑问代词who、what、which和疑问副词when、where、how、why等。 1.名词性从句句法结构： 从 属 连 词 that whether 主语从句 That he will come is certain.（that不可省） Whether she is coming or not doesn’t matter too much. （不能用if） 宾语从句 I think（that）he will be all right in a few days. I went in and asked if（=whether）they had a cheap suit. I wonder whether（不能用if）it is true or not. 表语从句 The fact is（that）I have never been there. The question is whether（不能用if）it is worth doing. 同位语从句 The fact that she had not said anything surprised all of us. They asked me the question whether the work was worth doing. 连 接 代 词 that who whom whose which 主语从句 Who will help him is not known. What he said is very important. Which side will win is not clear. 宾语从句 （1）作及物动词的宾语。例如： I really don’t know what he is doing. Do you know who/whom they are waiting for? He asked whose dictionary it was