The purpose for which electricity is used is numerous.其中for

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The purpose for which electricity is used is numerous.其中for which作什么成分

电被使用的用途有很多.
for which 是目的宾语,原句可还原为：
electricity is used for ...
再问：请问是“目的宾语”还是“目的状语”，for which引导是定语从句这个应该可以确定，我的问题是for which在从句中作什么成分
再答： for which引导的是定语从句，修辞先行词 purpose ，which作介词for的宾语，上面回答过句子可以还原成 electricity is used for （which purpose），所以for which 并不是一个整体，for 是谓语的一部分，use for是完整的谓语，而which 是句子的一个部分，为宾语。希望能帮助到你！望采纳！谢谢！
再问：首先感谢你的回答，但是这里我还是没完全理解清楚，如果句子还原成electricity is used for which ，which指代的是purpose,这样句子就成了electricity is used for purpose,而is used for这个谓语的意思是“被用来”或“被用于”，这样翻译成中文不成了“电被用于用途”，意思就感觉不对头啊
再答： be used for,被用来...被用作...全句可还原成陈述语气：electricity is used for numerous purpose.但想要方便理解句子的意思，可以将句子转换成the purpose of electricity is used is numerous."for"本身就有目的性，在purpose（目的）做主语时就可以省略了，你看看这样是不是好理解一点。
再问：从原句The purpose for which electricity is used is numerous如何变成为electricity is used for numerous purpose的了，前者为主系表后者为主谓宾啊

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