He did not leave his office until he had finished work这里从句为何用过去完成时?

He did not leave his office until he had finished work这里从句为何用过去完成时?
He did not leave his office until he had finished work这里从句为何用过去完成时?

He did not leave his office until he had finished work这里从句为何用过去完成时?
因为这里有“过去的过去”这个条件.
即在“did not leave”之前

完成工作发生在离开办公室之前，是过去的过去，要用过去完成时但是句子中是he did not leave his office是没离开，发生在he had finished work之前，前面的应该用过去完成时时态跟肯定否定没关系。你想一下，完成不完成工作肯定都是在离开办公室之前发生的。完成工作之后才发生离开之间事情，没离开是发生在之前是不是得先在办公室干活，然后才离开？所以时间上在过去，更靠前的就...

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完成工作发生在离开办公室之前，是过去的过去，要用过去完成时

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现在看这个事情，leave his office 是过去式，finish work 又在leave之前，现在看leave是过去式，finish就用过去完成时但前面是否定啊这个与句子否定形式没有关系，这个句子是这样翻译的not……until 直到 ……才……直到把工作完成他才离开办公室 不能那么死板的翻译...

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现在看这个事情，leave his office 是过去式，finish work 又在leave之前，现在看leave是过去式，finish就用过去完成时

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