名词性从句名词性从句(主语、表语、宾语、同位语从句)(一) 主语从句1 定义:用作主语的从句叫做主语从句。2 构成:关联词+简单句3 引导主语从句的关联词有三类:(1) 从属连词that。 如:That they were in truth sisters was clear from the facial resemblance between them.很明显,她们确是亲姐妹,她们的脸型很相似。(2) 从属连词whether。如:Whether hell come here isnt clear. 他是否会来这里还不清楚。(3) 连接代词who, whom, whose, what, which, whoever, whatever, whichever连接副词 where, when, how, why。如:What she did is not yet known. 她干了什么尚不清楚。解释:1 主语从句能用it作形式上的主语。常以it作形式主语的句型有:A. It+be+形容词(obvious, true, natural,