must have done的反意疑问句问题
问题描述：
must have done的反意疑问句问题
He must have finished his homework,hasn’t he
He must have finished his homework yesterday afternoon,didn’t he?
must have done本身就已经是对过去发生的是进行猜测了,为什么还有加不加yesterday afternoon的区别呢,为什么不加的就是强调现在的结果,而加的就是强调过去呢?
答
答案应该是didn't he 一、对现在情况的推测,问句部分用主动词（do,be)一般现在时的适当形式.若是现在进行时,问句部分用现在进行时的适当形式表示.若是there be结构,问句用isn't/aren't there.如：1)He must be there...