that在名词性从句里都是不充当成分的,没有实际意义,包括宾语从句,主语从句,同位语从句,表语从句,并且在宾语从句里经常省略,所以,不能用that做主语.
注意：that在定语从句中是做成分的,可以做主语.不一定要用it,根据句子需要
例如：
He admitted that he would be our new manager.he是主语,that不做成分,无意义
He admitted that it was difficult to work with Tom. it 做形式主语
that 可以做主语，但是它并不是从句的引导词，通常情况下，真正的引导词会被省略
I told her (that) that was my problem.
我告诉她那是我的问题
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