is said是什么時(shí)態(tài)

It is said是據(jù)說(shuō)的意思，后面的時(shí)態(tài)根據(jù)后面的內(nèi)容來(lái)定；
比如，It is said that you were still working last weekend. 據(jù)說(shuō)上周末你還在加班，因?yàn)檎f(shuō)的是上周末的事情，所以用過(guò)去式。