it is believe that与it is said that的区别

it is believed that是有人相信什么事的意思，而it is said that是据说的意思。二者句型中的 it 都是形式主语,真正主语是 that 引导的主语从句，二者都是主系表结构。

如：It is believed that there is a tiger in the mountains.人们相信这山中有一只老虎。

又如：It is said that he is multimillionaire.据说他是千万富翁。