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as as
其基本意思为“与……一样”，其中的第一个as副词，其后通常接形容词或副词(用原级)，第二个as可用作介词(后接名词或代词)或连词(后接从句)。使用时应注意以下几点：
1. 在否定句中，第一个 as 也可换成 so：
He doesn’t study as [so] hard as his brother. 他学习不如他弟弟努力。
2. 在该结构的两个as之间通常接形容词或副词的原级，但若涉及数量或程度，可用“as much+不可数名词+as”和“as many+可数名词复数+as”：
You’ve made as many mistakes as I have. 你犯的错误和我犯的一样多。
I haven’t got as much money as I thought. 我不像原来想像的有那么多钱。(R2/92)
其间接形容词时，有时该形容词还可修饰另一名词，但这个名词应带有不定冠词(注意词序)：
She is as good a cook as her mother. 她和她妈妈一样是位好厨师。
也可说：She is a cook as good as her mother.
但不说：She is as a good cook as her mother. 或They are as good cooks as us.
2.In eighteen eighty-three, American poet Emma Lazarus wrote a poem as if Lady Liberty were speaking. In part it says: "Give me your tired, your poor, your huddled masses yearning to breathe free ... I lift my lamp beside the golden door."
as if好像, 似乎, 仿佛
例句：Why doesn't she buy me a drink?It isn't as if she had no money!
她为什么不给我买一点饮料?好像她没钱似的!
