精选优质文档-倾情为你奉上过去完成时专项练习题定义：过去完成时是表示在过去某一时间或某一动作之前已经发生或完成的动作、事情。它表示的是发生在“过去的过去”的动作，只有在和过去某个时间或动作相比较的时候才会使用过去完成时。构成：过去完成时的构成: had +.(过去分词) 用法：1、与by, before, by the end of引导的表示过去的时间状语连用。例如：by then, by before nine oclock yesterday, by the end of last year, by the age of twenty, by the time I arrived 2、在过去不同时间发生的两个动作中，发生在先，用过去完成时；发生在后，用一般过去时。例如：When I returned home, my guest had already left. I did not see the film because I had seen it before.3、常用于told, said, knew, heard
