this article is written in(.)easy english that all of us can understand.这里为什么要用such easy而不能用rather或是so啊?

this article is written in(.)easy english that all of us can understand.
这里为什么要用such easy而不能用rather或是so啊?

如此……以至于 的搭配,首先排除rather.
用such的原因就是因为easy后面有个名词english,所以不能用so.such修饰名词.
你可以说it is so easy that all of us can understand.

such + noun 因为English是名词
so+形容词
rather是副词

such + adj. as . 固定搭配，意思是“如此。。。（以至于）。。。”翻译：这篇文章用如此简单的英文写成（以至于）你们所有人都能阅读。

提问者首先要知道一个常用的固定搭配so(such)...that，意思是“如此...以至”，如果so后面接的不只是一个形容词而是一个短语的话，则用such。举例如下：
She is so beautiful that many boys want to make friends with her.
She is such a beautiful girl that many bo...

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提问者首先要知道一个常用的固定搭配so(such)...that，意思是“如此...以至”，如果so后面接的不只是一个形容词而是一个短语的话，则用such。举例如下：
She is so beautiful that many boys want to make friends with her.
She is such a beautiful girl that many boys want to make friends with her.
由此可以明白原句中为什么选such了。

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