as as 时be动词的用法如题、为什么 例句 he runs as fast as me时候不加be动词哇、

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as as 时be动词的用法
如题、为什么 例句 he runs as fast as me时候不加be动词哇、

fast是副词,副词修饰形容词和动词,但这句是修饰动词,所以不能用be
这里有一些例句,你能看以下哦!
主语+谓语(系动词)+as+形容词原形+as+从句.表示两者对比相同.
This box is as big as mine.
这个盒子和我的一样大.
This coat is as cheap as that one.
这件衣服同那件衣服一样便宜.
I study English as hard as my brother.
我同我兄弟一样学习努力.

1

fast是副词,修饰run,一般现在时有两种结构: 1 be( am, is, are)如: He is as tall as Tom. tall是形容词,动词用be
2.行为动词,He runs as fast as me他和我跑得一样快,就是这种用法,所以不能用be