it is said that是什么从句
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it is said that 中is何时变was
it是形式主语，指代后置的主语从句。 如果用正常语序that is said，其实就是 “one says＋that引导的宾语从句” 的被动语态，未免主语部分太长，显得结构臃肿，所以就改用 it is said that句式。it is said that用法：it is said that是据说，据传言的意思。过去式it was said that + 句子，【谓语用过去时】。现在时it is...