一、概述:在句子中起名词作用的各种从句统称为名词性从句。根据它们在句中的语法作用,这类从句又可分为主语从句、同位语从句、表语从句和宾语从句。? 二.主语从句主要有四类:
(1) 由连词that引导的主语从句:引导词that无含义/在句中不做成分/不可以省。 例如:That you will win the medal seems unlikely.
That you are so indifferent bothers me.
That she survived the accident is a miracle. (2) 用连词 whether 引导的主语从句:
whether有含义(是否)/在句中不做成分/不可以省。
注意:引导主语从句,不能用if,只能用whether。
例如:Whether we will hold a party in the open air tomorrow depends on the weather.
Whether she is coming or not doesn’t matter too much. (3) 用连接代词引导的主语从句
在由连接代词who, whose, whom, which, what, whoever, whomever, whichever, whatever引导的名词性从句中,其连接代词在句中起名词性作用,担当一定成分. 例如:What you need is more practice.
What I want to know is this.
Whatever we do is to serve the people. 注:whatever / whoever的功用
whatever, whoever在主语从句中不含疑问意义。它引导主语从句,并在从句中作主语、宾语、表语等。whatever = anything that; whoever = anyone who。要注意和whatever, whoever引导的让步状语从句的区别。
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