名词性从句的功能相当于名词,从句作同位语,则是同位语从句,that引导同位语从句只作连词,只起连接作用,在从句中不作任何成分,没有词义:that引导同位语从句时一般跟在一个抽象名词之后,解释说明该词的内容。如fact,hope,thought,suggestion,idea,news,word,problem,possibility,promise.that引导表语从句时,从句作表语,一般不省略that,其主语的主句,根据意义或结构的不同有三种情况:(1)表示事实,真理的名词作主语如fact,truth,advantage,explanation,problem等。The fact is that he didn't notice ...
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