1 名词性从句名词性从句相当于名词,可分别作主句的主语、表语、宾语和同位语。因此,名词性从句分为主语从句、表语从句、宾语从句和同位从句。(一)引导名词性从句的连接词1、连接代词: who, whose, whom, what, which。有词义,在从句中担任成分,如主语、表语、宾语、或定语等。2、连接副词: when, where, why, how。有词义,在从句中担任成分,作状语。3、连接词: that, whether, if, as if 。that 无词义,在从句中不担任成分,有时可省略; if (whether), as if 虽有词义,但在从句中不担任成分。注意:@连接代词与连接副词在句中不再是疑问句,因而从句中谓语不用疑问式。@连接代词与连接副词在从句充当句子成分,连接词 whether 和 if(是否),as if(好象)在从句中不充当句子成分,只起连接作用。根据句义,如果连接代词与连接副词, whether、if 和 as if 都用不上时,才用that 作连接词( that 本身无任何含义)。(二)主语从句1、主语从句在复合句作主语。Who will go is not important. (用波浪线标出从句)2、用 it 作形式主语,主语从句放在句末。It doesn’t matter so much whether you will come or not.(用波浪线标出从句)3、that 引导主语从句时,不能省略。That he suddenly fell ill last week made us surprised. (用波浪线标出从句)(三) 表语从句1、表语从句在复合句中作表语,位于系动词之后。The question was who could go there. (用波浪线标出从句)2、引导表语从句的连接词that 有时可省去。My idea is (that) we can get more comrades to help in the work. (用波浪线标出从句)(四) 宾语从句1、宾语从句在复合句中作宾语。引导宾语从句的连词that 一般可省略。I hope (that) everything is all right. (用波浪线标出从句)2、介词之后的宾语从句,不可用which 或 if 连接,要分别用 what 或 whether。I ’m interested in whether you’ve finished the work. (用波浪线标出从句)I ’m interested in what you’ve said. (用波浪线标出从句)3、whether 与 if 都可以引导宾语从句,常可互换。但下面情况不能互换。①宾语从句是否定句时,只用if ,不用 whether。I wonder if it doesn’t rain. (用波浪线标出从句)②用 if 会引起误解,就要用wheth...