It is said that 的意思是据说,后面绝大多数情况是加一句俗语或谚语,或常识性的东西.表达这种意思的时候,It's said that是很自然而然一起脱口而出的.sb is said to 意思是某人被说在干什么.两者是不存在时态上的区别...两者时态如何转换呢？就是将It's said that与sb is said to相互转换，时态怎么变。最好多给几个例句。两句子转换的时候，时态是保持不变的。一般现在时态转换：it is said that he is a good student.=He is said to be a good student.=People say that he is a good student.一般过去时态转换：It is said that he slept late last ninght.=He is said to sleep late last night.现在进行时态：It is said that she is reading books =she is said to be reading the books现在完成时态：It is said that she have finished her homework ,=she is said to have finished her homework 当it is said that 句型中有isam are 的时候后面的就为 sb is said to be 当it is said that 句型中是动词时不管是不是过去式后面的sb is said to 只能接动词原形