She is very tall ,as is her mother.非限制定从 as不是领导前面整个句子吗那不就是她很高这件事 is her mother不是说不通吗书上说是非限制定从作表语 不懂为什么不是 as her mother is

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She is very tall ,as is her mother.
非限制定从 as不是领导前面整个句子吗
那不就是她很高这件事 is her mother不是说不通吗
书上说是非限制定从作表语 不懂
为什么不是 as her mother is

一般我们as引导非限制性定语从句时,
它指代的是上文提及的整个句子.在定语从句中可作,主语、表语、宾语等.
She is very tall , as is her mother.
这个句子中as不是指代一个句子,指代的是very tall,
即:her mother is very tall.
那么,as就是作表语了,不是定语从句作表语,定语从句本身就是定语从句了.