as 〜 as possible
     as 〜 as possible
     as 〜 as Ｓ can　　 　できるだけ〜

    Finish the work    soon.
    Finish the work as soon as possible.
    Finifh the work as soon as you can.
                        できるだけすぐにその仕事を終えなさい。
    I bought    many books.
    I bought as many books as possible.
    I bought as many books as I could.
　　　　　　　　　　　　 私はできるだけ多くの本を買いました。