as/so far as 和 as/so often as 都属于一类的， 是普通的普通的情况下， as + 形容词 + as 就是 与...一样+形容词

比如： he ran as far as tom他和tom 跑得一样远

he does his homework as often as tom他和tom做作业的频率相同

as/so well as 就有点特殊有两种用法， 一种是普通的， 跟上面一样， 另一种是表示“也”

例句： 普通用法： he speaks english as well as tom他的英语说得跟tom一样好

特殊用法: he, as well as tom, has joined the club.他和tom都参加了俱乐部