a letter that is written in pencil is difficult to read.为什么t

来源：学生作业帮编辑：作业帮分类：英语作业时间：2024/05/09 12:33:35

a letter that is written in pencil is difficult to read.为什么that做主语啊?不是宾语啊?
如果还原不就是 a letter is written 不就是 write a letter 不就是做宾语了吗?

"that is written in pencil"就是指的a letter is written in pencil.that =a letter
再问：那letter 不就是 write 的宾语了吗
再答：这里是被动语态。主语是that也就是letter。
再问：被动语态和我要弄懂的东西没有联系啊是？我觉得如果我说letter是宾语那这句话就没主语了能这样理解吗不然我实在弄不清
再答：这句是同位语从句。a letter is difficilt to read 是主句。that is written in pencil 是插入句。是对a letter的修饰。如果letter 做宾语，句子就要改为 somebody writes a letter in pencil. the letter is difficult to read .前者letter就是宾语。
再问：恩有道理谢谢~~~~

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