puzzled by the problem that was put forward at the metting 为

来源：学生作业帮编辑：作业帮分类：英语作业时间：2024/10/04 22:08:26

puzzled by the problem that was put forward at the metting 为什么用puzzled不用puzzling

省略主语
（He is） puzzled by the problem that was put forward at the meeting.
过去分词作形容词,表被动,He和puzzle是被动而非主动关系
而puzzling是物作主语时,某物“令人感到疑惑”
puzzled一般是人作主语,某人自身“感到疑惑”
再问：什么时候可以省略主语谢谢
再答：一般是祈使句或某些口语的句子，为了避免重复，省略主语等成分，建议你看下这里：http://baike.baidu.com/view/190767.htm 省略句，你的例句主要是考察谓语动词的语态，即主动或被动关系，可以参考这里：http://baike.baidu.com/view/84437.htm，这个例句跟以前学过的interested和interesting有些类似

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