The book is so helpful that I want to buy it.that的用法?什么成分?

来源：学生作业帮编辑：作业帮分类：英语作业时间：2024/04/28 20:30:36

so..that..是固定用法,意为：“如此.以至于.”
如果单独看that的话,它就是一个普通的连接词.
再问：去掉so可以吗
再答：可以的
再问： the book is nice that is what i want（to buy）这个句子正确吗？
再答：不正确，要在that之前加一个and就对了 the book is nice and that is what i want（to buy）.
再问： the book which is nice is i want（to buy） the book which is nice that is what i want（to buy）这两个句子怎么分析呢？哪个对？
再答：两句话都不正确。第一句：the book which is nice is i want（to buy）这句话你用which引导一个定语从句修饰book，这儿没错。错的在后面，the book which is nice is后面连接的是表语从句，缺少一个词来引导这个表语从句，所以要加个what。 the book which is nice is what i want（to buy）第二句：根据我对第一句的分析，很容易发现这句多了一个连接词that，删去就行了。

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