What is a pen used for?

来源：学生作业帮编辑：百度作业网作业帮分类：英语作业时间：2024/08/12 03:19:28

钢笔是用来做什么的?
或：钢笔是做什么用的
回答：It is used for writing.
再问：为什么不是What is a pen used for doing？
再答： be used for doing 结构 be + 过去分词构成被动语态
再问： a pen used for doing What
再答： What is a pen used for doing ? 钢笔是用来做什么的？

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