就是can't have seen 我觉得它的结构应该跟couldn't have seen 一样,而只是时态不一样而已,你认为囊 还有和couldn't see的区别,
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就是can't have seen 我觉得它的结构应该跟couldn't have seen 一样,而只是时态不一样而已,你认为囊 还有和couldn't see的区别,
就是can't have seen 我觉得它的结构应该跟couldn't have seen 一样,而只是时态不一样而已,你认为囊 还有和couldn't see的区别,
就是can't have seen 我觉得它的结构应该跟couldn't have seen 一样,而只是时态不一样而已,你认为囊 还有和couldn't see的区别,
一、虽然 could 是can 的过去形式,但是也可以表示现在,取代 can,只不过是在可能性上比 can 略差一些.
二、can't have seen 和 couldn't have seen 在一定得条件下可以互相替换,都是表示说话者当前对过去情况的否定推测.而 can't see 则是说话者对眼下情况的否定推测推测.
三、在表示逻辑判断时,常用下列三种猜测形式:
1.对现在的或然猜测:may + 动词原形
2.对过去的必然性的肯定猜测:nust have + 过去分词
3.对过去的必然性的否定猜测:can't have + 过去分词
如下题就是对过去的必然性的否定猜测:
You can't have seen Kate at the meeting last week; she has been on holiday in London for a month.
其中的判别标志就是句子中有 last week.
couldn't have seen 是虚拟语气的形式,can't have seen 则表示一种判断
couldn't see则表示过去时