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】
例句:
Someone says that she( works) as an actress.
It is said that she works as an actress.
She is said to work as an actress.
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