as + adj/adv + as
第一个as是副词，第二个as是连词。
She is as tall as her brother.
她和她哥哥一样高。
一样地；同样地
作为；以……身份；到相同程度或范围；被视为；就某种关系而言；例如
To the same extent or degree; equally.
到相同程度或范围
To such an extent or degree; to the same extent or degree.
被视为；就某种关系而言
Considered to be, in relation to something else; in the relation (specified).
She sings as beautifully as her mother.
她唱得和她母亲一样动听。
用法提示：第一个as是副词，表示“同样地”，用于比较结构。
I like music as well.
我也喜欢音乐。
用法提示：as在此是副词，意为“同样地”，与well构成短语。
He is not as tall as his brother.
他没有他哥哥那么高。
用法提示：第一个as是副词，表示“同样地”，用于否定比较。
第一个as是副词，第二个as是连词。
She is as tall as her brother.
她和她哥哥一样高。
as在此为副词，表示‘如同’。
He arrived late, as usual.
他像往常一样迟到了。
as在此为副词，引出类似情况。
As in the previous chapter, we will focus on the main idea.
如同前一章，我们将聚焦于主要观点。
grammar · medium
易错句子He works like a doctor.
正确表达He works as a doctor.
当表示职业或身份时，应该用as，而不是like。as表示‘作为’，like表示‘像…一样’。这里‘他是医生’是事实身份，所以用as。
grammar · medium
易错句子She is as tall her sister.
正确表达She is as tall as her sister.
在as...as比较结构中，第二个as不能省略。第一个as是副词，第二个as是连词或介词，连接被比较的对象。缺少第二个as会导致句子结构不完整。
as 作连词接从句，like 作介词接名词或代词，表示相似。如：She sings as I do (她像我一样唱歌) vs. She sings like me (她唱歌像我).
as 和 since 都可表示原因，但 as 更正式且常表示已知原因，since 更中性。如：As it is late, let's go home. (既然晚了，我们回家吧) vs. Since you are here, we can start. (既然你来了，我们可以开始了).
as 强调两个动作同时发生，when 可表示前后顺序或同时。如：As I was leaving, he arrived. (我正要离开时他到了) vs. When I arrived, he was leaving. (我到达时他正要离开).
一……就……
Call me as soon as you get home.
你一到家就给我打电话。
只要
You can go out as long as you finish your homework.
只要你完成作业，就可以出去。
就……而言
As far as I know, she's still in Paris.
据我所知，她还在巴黎。
以及；和
He is a teacher as well as a writer.
他既是老师，也是作家。
几乎；差不多
The work is as good as finished.
工作差不多完成了。
也；同样地
She can sing, and she can dance as well.
她会唱歌，也会跳舞。
Choose the next layer that will help you use as with more confidence.
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Dictionary facts from DICTIONARY_API_DEV, ECDICT, WIKTIONARY.