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4、当条件状语从句表示的行为和主句表示的行为所发生的时间不一致时，动词的形式要根据它所表示的时间来调整。这与以上三种情况不同，虚拟语气的谓语动词形式没有遵循以上规律。
    For example:
    If you had worked hard, you would be very tired. (从句说的是过去，主句指的是现在。)
    If he had followed the doctor’s advice, he would be quite all right now.
    If I were you, I would have gone home.
    Now let’s do some translation:
    如果她过去没有刻苦训练的话，就不会跑得这么快。（从句动作指的是过去，主句指的是现在的情况）(Fact: She has trained very hard, so she is able to run very fast now.)
    If she hadn’t trained so hard, she wouldn’t be able to run so fast.
    如果你当初每天都练习说英语的话，你的英语就会说得很好。（从句动作指的是过去，主句指的是现在的情况） （fact: You didn’t practice speaking English very hard every day, so you can’t speak English very well ）
    If you had practiced speaking English every day, you would speak English well enough.