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为什么最后用hadfallen过去完成时,而不用过去式?WhenICAMEbackintothehouse,itwasraining(去more)harderandharder.ThenIheardaloudcrashingsoundfrom(去the)backofthehouse.WhenIranouttofindoutWHAThadhappen

题目详情
为什么最后用had fallen 过去完成时,而不用过去式?
When I CAME back into the house,it was raining (去more)harder and harder.Then I heard a loud crashing sound from (去the)back of the house.When I ran out to find out WHAT had happened,a big tree had fallen down and BROKEN the top of the backroom.
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答案和解析
ran已经是过去式了,倒了发生在ran的前面,过去的过去用had done