Question

it is said that用法

在过去·现在·将来时态的一般形式
顺便将sb. is said to 一般形式讲下
（从句）

Answer 1

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 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.

Answer 2

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】

提供几个实例，请注意括号内的时态，相信您会领悟到：
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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Answer 3

it was said that
it is said that
it will be said that