must have been在主句是一般过去式的宾语从句中变为must had been吗 ?两小时内给出答案

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must have been在主句是一般过去式的宾语从句中变为must had been吗 ?两小时内给出答案
must have been在主句是一般过去式的宾语从句中变为must had been吗 ?两小时内给出答案

must have been在主句是一般过去式的宾语从句中变为must had been吗 ?两小时内给出答案
很乐意为你解答这个问题!
首先要清楚must,can,should ,may,might 等等情态动词后面动词一定要用原型,也就是说must无论是做“猜测”还是“必须”的意思,后面一定是跟动词原形的.也就是说must have been是正确的说法.而你所提到的must had been是不存在的.我明白你是为了强调是过去的时态,但是在语法中must have been 就可以表示在过去时态下的意义.
例如：I thought he must have been at home last night.就表示：我认为他昨晚一定在家.
.

不是。

对,现在的完成时是must have been ,过去完成时是must had been,所以过去式对应的形式为后者

不是 must 后无论何时都用原型你得给出句子才知道具体答案是什么我问的是must be表示"一定是"的情况.可以是must have been 其实要变的话应该是变must 只是它变来变去都一样所以感觉没有变化如果你这个句子把must改成can 你就看出变化了 must后面到底用什么时态具体要看句子表达的意思...

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不是 must 后无论何时都用原型你得给出句子才知道具体答案是什么

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应该不是吧...must 好像是情态动词，后面是原形

情态动词后加动词原型，此处must为情态动词，只有must have been，没有must had been。

不是的。must是情态动词，其后只跟动词原形。可以直接用must have been表示过去的。

对

不是。must后面无论怎样都是动词原形。

不能。must后加原型

不对，must have been 本来就是对过去的推测，意为“过去一定做了某事”，比如
She said:' Tom must have been late yesterday"---------“she said that Tom must have been late the day before"

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