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in bbc.co
As with would have, and should have, could have is used to talk about the past and refers to things that people could have done in the past, but didn't attempt to do or succeed in doing:
• I could have gone to university, if I'd passed my exams.
• If he'd trained harder, I'm sure he could have completed the swim.
既然有樹枝頂住, 是否不應該用would have, should have 同 could have? 我覺得可以用might have. 但要加強"save him from more serious injuries的可能. 我會用might probably have.
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