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hand in you papers when you__(finish)the test

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hand in you papers when you__(finish)the test
have finished
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再问: 为甚不用将来完成时
再答: 一是理解成条件句: (You) hand in you papers when you have finished the test . 就是说: if you have finished the test ,then hand in.... 另一种想法。 (You) hand in you papers when you have finished the test . 主从句其实动作很近, 要保持一致的时态。