i should have been there,but i()not find the time.求讲解,为什么用could,而不用would,should,might?

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i should have been there,but i()not find the time.求讲解,为什么用could,而不用would,should,might?
i should have been there,but i()not find the time.
求讲解,为什么用could,而不用would,should,might?

i should have been there,but i()not find the time.求讲解,为什么用could,而不用would,should,might?
虽然语法中这里可以用would、should、might、could,但是,could是can的一般过去时,有能力、可以的意思,在这一题中,后半句的意思是“但是我不能找到时间”could用在这里比较合适.

我应该来过这儿,但是我不能想起时间了。could表示能力,是不能想起。其他的都没有这方面的意思

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