急需知道”情态动词+have”用法即”may/might/must/can/could等+have"的意义及区别比如说：must have + done 以及 must have + been done 的意义及区别还有：can/could/may/might/must + have 之间的意义 用法以及区别
问题描述：
急需知道”情态动词+have”用法即”may/might/must/can/could等+have"的意义及区别
比如说：
must have + done 以及 must have + been done 的意义及区别
还有：
can/could/may/might/must + have 之间的意义 用法以及区别
答
must have + done 应该做了……
must have + been done 当时应该做……
上面的几个组合只是语气上有区别