as...as one can =as...as possible 尽可能地...

abc

非常地道的有用的表达和写作句式，as...as one can =as...as possible 尽可能地...
a. 造句方法：
1）       先造一个含有形容词或副词的句子；
You must study hard.（你一定婆用功。）
hard (adv.)
He remained quiet. （他保持沉默。）
quiet (adj.)

2）        在hard或quiet之前置入第一个as （作副词，中文译为“一样地"）: 即：
You must study as hard.
He remained as quiet.

3）        添入as one （you, he...） can或possible, 即吿完成。 即：
You must study as hard as you can (as possible).
（你要尽可能地用功。）
He remained as quiet as he could (as possible).
（他尽可能地保持安静。）

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b.        理论解释:
1）     as one can之后省了与前面主句中相同的部分，以避免赘述。
You must study as hard as you can study hard.
— You must study as hard as you can.

He remained as quiet as he could remain quiet.
— He remained as quiet as he could.


2）    as possible系为as it is / was possible简化而成，it是代词，代替前面相同的部分。
You must study as hard as it is possible.
= You must study as hard as studying hard is possible.
动名词（作主语）
He remained as quiet as it was possible.
= He remained as quiet as remaining quiet was possible.
动名词（作主语）