as soon as possible与as fast as possible有什么区别？

as soon as possible与as fast as possible有什么区别？

听起来似乎差不多,尤其是中文,都有
尽快的意思.区别在于：as fast as 表示动作上尽可能的快,是说动作本身,比如：he is running as fast as he can 他用最快的速度往那儿跑.
as soon as 是指尽快地去做那个动作,比较一下：he runs there as soon as possible,他一旦可以（跑）
就马上往那儿跑了.
当然有时候也会有差不多的意思,如
：reply me as soon as possible（或as fast as possible）尽快给我回复 总的来说,fast 比较具体,而soon 比较抽象 希望能帮助到你追答possible=sb can

fast当然也可以作副词用.
一般来讲quickly是指“动作迅速地,敏捷地”,比如老师让你起来回答问题,你很磨蹭,他会说“quickly”,意思是“快点儿; 迅速点儿”
“fast”表示速度快,如“He can ran fast.”,意思是“他跑得快.”这句中你就不能说“He can ran quickly.”,那就不合适.
希望俩个例子能够使你体会到差别.追问啊？?。。