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must hAvE BEEn的用法

had to 是 have to 的过去式,表示的是“不得不”做什么事的意思。 而"must have been"表示有把握地判断某事已发生 ,

你好,很高兴在这里回答你的问题: . . . If he have, I must have been a baby. 要是他看见过,那一定还在我是婴孩的时候。

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。

只要记住这: must have been ... 那时一定是can't have been... 那时不可能是 再好好理解这几人句子,相信你就理解啦. He can't have been ill. He must have been tired. She can't have been forty. She must have been fifty. He can't have b...

1. He can't come. 他不会来了。( 不会 / 不可能 ) 2.He must be ill.他 肯定 是病了 3. he can't have been finished the work.他 不可能已经 完成了工作过去做过某事对现在产生影响的 否定 推测 既“不可能做过某事”------简单的说,对 过去 ...

是对系动词be的完成时态事情的肯定性很大的推测。如: You must have been in Beijing for many years. 你一定在北京多年了。

can 与 must 是情态动词。情态动词后面用动词原形。还有should,may也是情态动词。 Neither of +名词复数+动词单数(正式时候) ,neither后面不可接不可数名词.

已经被……占有,现在完成时已经有这个意思,用had就是过去完成时了,以过去某个时间为依据,这里没有

have to do sth.必须做某事。一般情况做动词:有,eg:I have a pen.第三人称:has.过去时:had.过去完成时:haven.在具体语境中have还可以翻译成其它很多意思。

用法没错。 must have done 表示对过去已发生的事情的猜测。 It must have been fun. 那一定很有趣。(已经发生过了)

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