must have done 和 must do 有什么区别!哪一个是表示对过去的猜测呢?

must have done 和 must do 有什么区别!哪一个是表示对过去的猜测呢? may have done sth 和might be 都是表示对过去的猜测 有什么区别? must have done 表示猜测 那 must do 表示什么 could only have done表示对过去的推测,只可能...,是否等于must have done? 英语中关于推测的用法.比如：must have done是对过去的猜测 要情态动词的过去 未来 现在 的推测常用词组 can/could have done 和may/ might have done 表示对过去发生事情的猜测 哪一组可能 must have done和have done有什么区别 不是must做情态动词对过去推测用must have done,又是进行时,用must have 用must+现在完成时表示对过去的猜测的句子怎么改反义疑问句? must have done 和must have do must have been doing与must have been done都表示推测,有什么区别呀? must have done,must do,can't have done,can't do的区别