摘要:过去完成时可表示截止过去某一时间动作的总或动作的结束. e.g. By the end of last month. We had reviewed four books By eight o'clock, he had finished his homework. 与这个时态连用的时间状语常有: by 1985, by eight o'clock, by then, by the end of last month, by the time when, when, as soon as, before 等连词引导的时间状语从句.表示主句动作结束的时间. (六)现在进行时主要用于:

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