名词性从句 在复合句中具有名词的性质的作主语、表语、同位语、宾语的从句叫名词性从句。因此，我们把主语从句、表语从句、同位语从句和宾语从句这四种从句统称为名词性从句。种类作用常用关联词例句主语从句在复合句中做主语，相当于名词，一般置谓语之前，也可用it作形式主语，主语从句放主句之后that, whether, if, as if, as though, who, whose, which, how, when, where, why, what, whatever, whoever, whereverWhether he will come or not doesnt matter much.Whoever comes here will be welcome.表语从句在复合句中做表语，相当于名词，位于系动词之后It looks as if it is going to snow.宾语从句在复合句中做宾语，相当于名词He asked me which team could win the game.同位语从句放在名词之
