It is said that...这句形式主语中 said 是什么词性啊..

It is said that...这句形式主语中 said 是什么词性啊.. It is said that. it is said that It is said that是什么结构 I heard it said that he had gone abroad 请问said 在这里是什么词性 It is.that..这句形式主语里面 it is said that用法 It is sometimes said that... 关于it is said that It is said that the it is said that dogs. 为什么是It is said that 而不是It said that