摘要：5．Could可以用在虚拟条件句中. If I could fly, I should be very happy. 如果我能飞. 我会很高兴. If you had followed my advice, you could have finished it. 如果你当时听我的.你早就做完了. If you had tried harder, you could have passed your exam. 如果你再努力些.你就能通过考试了.

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