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it is said that是主语从句。不用虚拟语气。在主语从句中, 为了防止句子头重脚轻，通常把形式主语it放在句首位置，真正主语搁置于句末用it作形式主语的结构。
it is said that是啥从句
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 said that +句子【谓语用现在时】
将来时，it will be said that +句子【谓语用将来时】
it is said that例句
1、It is said that God is almighty.
2、It is said that civilization is always on the move.
3、It is said that Xiao Li's father is a bigwig.
4、It is said that imitation is the sincerest flattery.
5、It is said that the universe is infinite.
6、It is said that Lapis helps one understand the mind.
7、It is said that the painting was his swansong.
8、It is said that China may fill up the void.
9、It is said that the public transportation of American cities is not very desirable, is it?
10、It is said that good health is priceless for it is something money doesn't bring.