must have done的反义疑问句

来源:百度知道 编辑:UC知道 时间:2024/05/11 13:00:00
must have down的反义疑问句应该用什么?don't,didn't,hasn't,haven't说什么的都有,好像还牵扯虚拟语气
请高人给一个系统的讲解,谢谢~~~我会加分的

你好^^
情态动词+动词完成时,即情态动词+have+done.表示对过去的行为或动作进行推测,评论或者判断.
1.must have done.
表示对过去某事的肯定猜测,其否定或疑问形式都用can/could来表示。
例如:since the road is wet,it must have rained last night.
2;当然对现在发生或者将来发生的事情,要用must do表示猜测,否定为can’t do
he must understand that we mean business.
you must be hungry after a long walk.

反意疑问句中含有Must的情况主要有以下几种:
1)作为情态动词表“必须”,这时反意疑问句直接用mustn'/needn't
2)当must表示推测时又分以下几种情况:
a:对现在事实的推测,反意疑问句与must后面的动词呼应,如:
You must be joking,aren't you ?
b:对过去事实的推测,表示动作的时候用did 当助动词,表示状态时用was,如:
Mr Green must have been punished for his being rude at the meeting,didn‘t he ?(格林先生一定因为昨天在会上鲁莽的行为被处罚了,是吗?) 被处罚表示一个动作
She must have been a policeman ,wasn't she ?(她过去一定是个警察,是吗?) 是警察表示一种状态

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,isn't he?
2)He must have a big family,doesn't he?
3)He must