must be和must have been有什么区别he must have been sleeping.为什么这里要用must have been而不用must be

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must be和must have been有什么区别he must have been sleeping.为什么这里要用must have been而不用must be
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must be和must have been有什么区别he must have been sleeping.为什么这里要用must have been而不用must be
must be和must have been有什么区别
he must have been sleeping.
为什么这里要用must have been而不用must be

must be和must have been有什么区别he must have been sleeping.为什么这里要用must have been而不用must be
从过去到现在 动作或者说是状态一直持续着 在这里 我觉得是指他刚才就开始睡了 现在也还睡着 可能是强调有一段时间了吧

must be
基本翻译
一定要;肯定是;一定
网络释义
must be:一定是|有时也不一定表示推测,而是表示必须。如:|一定
must-be quality:应达质量
Must-be:必须|必备属性|必要特性
must have been
基本翻译
一定(对过去事实肯定的推测)
网络释义
must have...

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must be
基本翻译
一定要;肯定是;一定
网络释义
must be:一定是|有时也不一定表示推测,而是表示必须。如:|一定
must-be quality:应达质量
Must-be:必须|必备属性|必要特性
must have been
基本翻译
一定(对过去事实肯定的推测)
网络释义
must have been:穴旦正永申件
must soon have been drawn into the pond:(小矮人)没多久就会被拖进池塘中。
there must have been:准已有

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