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the chikdren went home from the grammar school,their lessons

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the chikdren went home from the grammar school,their lessons_____ for the day.答案填finish...
the chikdren went home from the grammar school,their lessons_____ for the day.答案填finished,为什么不能填had finished?
their lesson finished for the day是一个独立成分(即非谓语形式),并不是一个句子,所以不能用带有时态变化(如过去时、将来时、完成时)的动词-那叫谓语.finished是过去分词,属于非谓语形式一种,作状语用