must have been,must have been done,must have done三者的区别?

Question

must have been,must have been done,must have done三者的区别?

Answer 1

must have been 一定是已经xxx（做某件事）
must have been done 一定是已经完成了
must have done一定完成
been指“被”，有been的句子就是被动句，某个动作被进行的意思。

Answer 2

sb. must have been to 某人肯定已经到过某处
sth. must have been done 主语是被动的，一般为某事肯定已经被做了
sb. must have done 主语是主动的，某人肯定已经做了某事本回答被网友采纳

Answer 3

均表强烈的虚拟语气；1.肯定原为......；2.肯定原来被做......；3.2.肯定原来做......；

Answer 4

其实两者在时态都没有什么区别，都是表示过去一定做过某事~但是~
must
have
been强调的是状态
must
have
done强调的是动作~