定语从句 This is the book that you are looking for the book.为什么后面要把the book 删掉This is the book that you are looking for the book.为什么后面要把the book 删掉?This is the book that you are looking for.那如果我改为

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定语从句Thisisthebookthatyouarelookingforthebook.为什么后面要把thebook删掉Thisisthebookthatyouarelookingfortheboo

定语从句 This is the book that you are looking for the book.为什么后面要把the book 删掉This is the book that you are looking for the book.为什么后面要把the book 删掉?This is the book that you are looking for.那如果我改为
定语从句 This is the book that you are looking for the book.为什么后面要把the book 删掉
This is the book that you are looking for the book.为什么后面要把the book 删掉?This is the book that you are looking for.
那如果我改为:This is that you are looking for the book.这句就成了表语从句了,

定语从句 This is the book that you are looking for the book.为什么后面要把the book 删掉This is the book that you are looking for the book.为什么后面要把the book 删掉?This is the book that you are looking for.那如果我改为
因为前面的引导词that就是代替先行词the book 在从句中作for的宾语了,再加上它就重复了,这是定语从句的内容,that属于关系代词,代替前面的先行词在后面的从句中作宾语、主语、表语等
至于你后面的句子也不对,其实最简单的就是This is the book you are looking for(that在从句宾语可以省略)

This is the book (that you are looking for).
你没有理解定语从句的含义, that 就代替的是the book 。

This is the book that you are looking for.这里that就是指代 the book 的,所以后面不用再说一遍了
不对,你改过之后,句子不通了。
表语从句是这样的:
The trouble is that we are short of funds.

去掉the book的原因是that已经有指代前面the book的意思了,去掉的作用会有去掉重复的作用。
你改为:This is that you are looking for the book.这句并不是表语~
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