later that morning, when i was doing the housework, 不是过去式吗怎么用WHEN

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later that morning, when i was doing the housework, 不是过去式吗怎么用WHEN

句子不完整.housework后还有句子的主谓结构.
比如lLater that morning, when i was doing the housework, my father came in.
翻译为“那天早上过了会儿,当我正在做家务时,我爸爸来了.”
这里的when是针对后面“i was doing the housework”这件事的,指“当……时”.

为什么不能用when呢..