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as引导让步状语从句时，状语表语及谓语动词的一部分置于as之前，且表语
中的冠词要省略。如：Try as we did we failed again.又如：Late as he
came he saw the famous man.而although则无此种用法，句中although应改为 as.
as引导让步状语从句时,常放在作表语,状语或谓语的一部分的形容词,名词,副词或动词原形之后.如果是单数名词或形容词的最高级作表语,不再用冠词.
however和as 引导让步状语从句时的区别：
however引导让步状语从句时，相当于no matter how,后面跟形容词或副词；as引导让步状语从句时，用倒装语序，即把作状语的副词或作表语的形容词或名词提前，而且如果作表语的是单数名词，前面不加冠词，也可以把谓语动词部分的实义动词提前。
〔误〕 As hard he works, he can’t catch up with his classmates.
〔正〕 However hard he works, he can’t catch up with his classmates.
〔析〕见上述说明。
〔误〕 A model worker he is, he remains modest.
〔正〕 Model worker as he is, he remains modest.
〔析〕as 引导让步状语从句，前面的单数名词前不加冠词。
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