名词性从句分为主语从句,宾语从句,表语从句,同位语从句等。
主语从句:that, whether, who, whom, whose, what, which, when, where, why,how,whatever,whichrver,however, whoever等
宾语从句:同主语从句,外加if
表语从句 :同主语从句外加 as if, as though, as
同位语从句:that,whether.who, whom, whose, what, which,when, where, why, how
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