英语句子中为什么要加Who 比如 I know a lady who come from.

来源：学生作业帮编辑：作业帮分类：英语作业时间：2024/10/04 03:25:51

首先此句为定语从句,用定语从句是为了使句子有更为完整的表意作用.从句与主句关系密切,去掉从句即who come from.则主句意义不完整,甚至不合逻辑.
I know a lady who come from.一句中,I know a lady 为主句,lady 是先行词.当先行词为人时用who 作主语.
I know a lady .The lady comes from……为避免重复,用who 代替the lady.
附：定语从句一般由关系代词和关系副词引导,关系代词和关系副词必须位于从句之首,主句的先行词之后.起着连接先行词和从句的作用,同时在从句中又充当句子成分.

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