能解释下过去完成时吗通俗点

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能解释下过去完成时吗通俗点能解释下过去完成时吗通俗点能解释下过去完成时吗通俗点过去的过去,注意特定的时间状语,间接引语等的用法举例说明1,whenarrived,hehadleft2.Ihadlear

能解释下过去完成时吗通俗点
能解释下过去完成时吗
通俗点

能解释下过去完成时吗通俗点
过去的过去,注意特定的时间状语,间接引语等的用法
举例说明
1,when arrived,he had left
2.I had learnde 3000English words by the end of last month
3.Before last weekend ,he had never come to see me
4.He said he had returned the book to her