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请大家帮分析这个句子,这里谓语是哪个,how在这里起什么作用,什么成分,Harrydoesnotneedtobepromptedtoexplainhowheboughthispreciousbottleofmud

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请大家帮分析这个句子,这里谓语是哪个,how在这里起什么作用,什么成分,
Harry does not need to be prompted to explain how he bought his precious bottle of mud
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答案和解析
how he bought his precious bottle of mud
how 在这里引导宾语从句,表示方式.
句子谓语是 does not need ,need是主体谓语.does是助动词