精选优质文档-倾情为你奉上高中主语从句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.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. 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. whatever, whoever在主语从句中不含疑问意义。