She told me that 500 stamps would have been collected when s

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She told me that 500 stamps would have been collected when she was twenty 哪位大侠帮忙分析下语法
那位大侠帮忙分析下这句话语法结构,比如时态什么的,
后面的状语从句when she was twenty 为甚么时态是刚过去式？

译文：她曾告诉过我说她要在20岁前集满500张邮票.
She told（首先是过去的） me that（间接引语） 500 stamps “would have been collected”（将来完成时,之所以是would是由于这里是间接引语,要与主句谓语的时态相一致） when she was twenty .
这句话你可以理解为主句是过去时,而从句是将来完成时的过去式间接引语；也可以理解为整句是一种“过去将来完成时”.
实际上,这种时态划分是中国语言学家为适应我国学生学习方便制定的.从语法上讲英语没有这种时态的式,法语的“将来时逾过去式”才算能对应.

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