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must表推测时 must Do 和must hAvE DonE的区别

must表推测时 must do 和must have done的区别 must表推测时 : 必定,一定 The light is still on, so he must be at home. 灯还是亮的,他一定在家。 The light was out. They must have gone to bed. 灯都熄了,他们必定睡了。 注意:1. must...

must have done和must have been doing的区别: 您好。两者都是表示肯定的推测。 must have done:是说你肯定做了某事。 must have been doing:译为肯定当时正在做某事,只有意思的区别。

must have done 表示对过去的猜测,must do 必须做某事

the child must have been cried错,语义不对;不能使用被动语态; the child must have cried对,孩子肯定哭了。

must属情态助动词,表推测时只应用于肯定句,意为‘‘一定’’,这时附加问句中的助动词要于与must后面的主要动词相照应,注意根据时间确定适当的时态。如: You must have misheard,haven't you? It must have rained last night,didn't it?

must have done 是对过去情况非常肯定的推测 should have done是过去本应该做某事而实际上没有做。 二者一般不会混淆。 ~~英语教师团真诚为您解惑!~~

1. must的否定形式表示“禁止/不许”,不能表示推测; mustn't have done sth此种形式的确不存在,must have done sth“一定做过某事”的否定形式是can't/couldn't have done sth,意思是“不可能做过某事”。 2. 推测只是一种语言现象的目的,即用某...

情态动词 + have done 动词 + 动词完成式即“情态动词 + have + done”,表示对过去行为或动作进行推测、评论或判断。这个结构是近几年高考情态动词的重点和难点。 一、在虚拟语气中的用法 1. should have done 表示“过去本应该做某事却未做。”其...

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,isn't he? 2)He must...

1. mustn't在英语中不能用于表示推测,但是可以表示“禁止/不允许”之意。 如:You mustn't smoke here. 在这里你不许抽烟。 2. can't/couldn't表示推测时,意思是“不可能...”,语气非常坚决的否定推测。 根据动作发生的时间,一般分为以下三种情...

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