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六级语法辅导之一般过去时和过去完成时
2011英语六级语法辅导之一般过去时和过去完成时
（1）一般过去时表示过去发生的动作或存在的状态，而过去完成时表示在过去某一动作发生在另一动作之前。试比较：
The class had already begun when I came to school. 我来到学校时，已经开始上课。
He had gone home before I got to his office. 我到他办公室以前，他已回家了。
（2）有after或before引导的时间状语从句的复合句中，由于从句动作和主句动作发生的先后顺序已经非常明确，所以可以用一般过去时代替过去完成时：
He called on me soon after he had returned. 他回来不久便拜访我。也可以说：He called on me soon after he returned.
The train had left before I got to the station. 我到车站时，火车已经开走了。也可以说：The train left before I got to the station。
（3）描述一连串的过去动作，无需用过去完成时，例如：
He stood up， took his bag， put on his hat， left the room and went away. 他站起来，拿起书包，戴上帽子，离开房间走了。
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She looked around but saw nothing. 她环顾四周，但