She looks younger than she is. 为什么是is不是does?

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Shelooksyoungerthansheis.为什么是is不是does?Shelooksyoungerthansheis.为什么是is不是does?Shelooksyoungerthansheis

She looks younger than she is. 为什么是is不是does?
She looks younger than she is. 为什么是is不是does?

She looks younger than she is. 为什么是is不是does?
这个句子省略了她的年龄,
也就是She looks younger than she is(多大).
所以后面不能用does,而是要用is

因为还原过来是she is young 不是she does young

这个问题深究起来非常复杂。简单理一下概念：
此处looks作连系动词+表语 younger 即系表结构
同时is即 be 动词是最基本的连系动词，意为“是”；look 意为看上去（像/是），根据句子结构成分判断，故用is 而不是代替行为动词的助动词does。
一般在比较句的结构中，后面重复的非主语成分多以be\助动词代替
另外，教你一种简单方法：语感。读两遍，哪...

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