一般过去式和过去完成时的比较:
一般过去式表示过去时间发生的动作或存在的状态,而过去完成时在过去某一时间或动作之前已完成的动作或状态,即过去的过去。当强调过去某一动作发生在某一动作之前时,常用此时态。
如: He had finished his homework before nine oclock.九点之前他已经完成了作业。实际上,一般现在时和过去完成时常搭配使用。如:When he got home, his daughter had already gone to bed. 当他到家的时候,他的女儿早已去睡觉了。
在带有after和before引导的时间状语从句的复合句中,由于从句的动作和主句的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。如:He called on me soon after he had finished his homework. 他做完作业后不久便来拜访我。也可以说:He called on me soon after he finished his homework.
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