Could 的语气介于委婉与肯定之间，可以表示一种潜在的能力或可能性。 时态和语态： would 和 might 常用于过去将来时或虚拟语气中，表示对过去或未来情况的假设或推测。 should 不受时. 当打开一个软件时弹出“could not open boxfile”的错误窗口时，可能存在多种原因导致此问题。 以下是一些常见的解决方法： 1. 为什么 could 比 can 更委婉？ 一般国内的人只会说 could 比 can 更委婉，顶多再多说一句：could 是 can 的过去式，所以更委婉。 打算回答本问题的各位朋友，如果只能给… 显示全部 关注者 8
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☒ the authors declare that they have no known competing financial interests or personal relationships that could have appeared to influence the work reported in this paper. But with such a father and mother, and such low connections, i am afraid there is no chance of it. 注意i wish后面。 如果真心为jane惋惜，她应该说she could，表达对jane未来. I wish i could have gone with you to the concert last night.
Should have done，表示过去本应该做的事情，但却没做。其否定形式表示过去本来不应该做某事，但是实际上却做了。 could have done，表示：①对过去某种情况的怀疑或者是不确定（情.
The experts considered the likelihood that risks could become serious problems in the future.they.
