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编辑推荐：2015成人英语三级考试复习重点汇总
主句与从句时间不一致时虚拟语气的构成
当虚拟语气的if虚拟条件从句和主句的动作发生的时间不一致时，要根据各自表示的时间采用对应的虚拟语气的构成形式。
例：1、If I had attended the meeting yesterday, I would know what happened now.
2、If you had taken our advice at that time, you would not be in trouble now.
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