宾语从句中,当宾语从句的主句为一般过去时,且从句的动作先于主句的动作时,从句要用过去完成时,常见于told, said, knew, heard, thought等动词的宾语从句。如:
She said that she had seen the film before.她说她以前看过这部电影。
在时间、条件、原因、方式等状语从句中,主、从句的动作发生有先后关系,动作在前的,要用过去完成时,动作在后的要用一般过去时。如:
After he had finished his homework, he went to bed.他做完家庭作业后,就上床睡觉了。
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