名词性从句包括 主语从句 宾语从句 表语从句 同位语从句
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
定语从句:关系代词who which that 关系副词where when why
追问在名词性从句中哪些引导词可以在从句中不做成分
追答that引导名词性从句只起连接作用,在从句中不作任何成分,无意义,在宾语从句通常省略,但在主语从句、表语从句和同位语从句中均不能省略