must have done 表示猜测 那 must do 表示什么

must have done 表示猜测 那 must do 表示什么 could have done能不能表示对过去事实的猜测用在肯定句中?与must have done may have done might have done 关于 must have done.It must have rained last night.表示 对过去的肯定猜测 昨晚肯定下雨了.那么要表示对过去的否定猜测怎么表达呢? 比如说昨晚肯定没下雨. must have done 和must have domust have done是对过去的肯定猜测must do 是对现在的肯定猜测吗?一定是 “肯定 ” must have done 和 must do 有什么区别!哪一个是表示对过去的猜测呢?有人说must后面接动词原形是对现在的猜测! must与must have done 的区别是什么?猜测的时态 must have done 和must have been 的区别都是对过去的猜测,二者的区别是什么? must have been done must have done must have done 和 should have done 的表示推测区别?must have done 和 should have done 都表示推测时,区别是什么? could only have done表示对过去的推测,只可能...,是否等于must have done? couldn't have done与couldn't区别以及当could have done表示对过去的猜测时,could have done与could有什么区别? must have done 和 must do 有什么区别!哪一个是表示对过去的猜测呢?有人说must后面接动词原形是表示对现在的推测!那按照这个说法must do是表示对现在的推测! must have been doing与must have been done都表示推测,有什么区别呀? 情态动词+have done 如 could have done,must have done,should have done 等等在如他么的否定词表示什么意思? can ,may ,must ,have to ,shall ,will ,need的英语语法?表示本意和猜测. that must have done the must be must have done 区别 must have been done/must be done求解两者异同