by the time和had learned的翻译

来源：学生作业帮编辑：作业帮分类：英语作业时间：2024/07/14 11:33:05

初中三年级的重点考核内容之一——过去完成时,其结构“had+动词的过去分词”.
一般来讲,当句子中有by the time时,在初中阶段的考试中,只要选“过去完成时”的句子一般都对.
“had+动词的过去分词”所表示的动作,发生在“by the time（到.时间为止）”所提到的时间点之前.这个是衡量是否用“had+动词的过去分词”结构的关键.
例：By the time we came to the stop,the bus had left.（请问是我们先came的,还是bus先“had left”的,显然是车先离开,所以在表示“两个过去的动作,一前一后发生的时候,离现在更远一些的那个动作就用的是“过去完成时”）.

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