must have stolen 和must be stolen的区别?

题目

must have stolen 和must be stolen的区别?
另外：一句话中又有情态动词，又是进行时，情态动词后的动词还要原型吗？

答案

主动和被动语态.
情态动词后必须是动词原型,时态可以通过后面的结构体现,比如,进行时must be working,must be playing,完成时must have finished,被动式must be stolen,完成时的被动表达must have been done