精选优质文档-倾情为你奉上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(obvi
