by far 和so far的区别：中文意思不同、用法不同、强调重点不同。by far的意思为“显然”、“…得多”、“大大地”，比较时用作强调，常与动词的一般时、将来时、完成时或将来完成时连用；so far的意思为“目前为止”、“如此程度”，后接名词、代词、形容词、副词、过去分词或动名词。
一、by far的意思及用法
by far意为显然,…得多，大大地。比较时用作强调。
例句：The economy is the number one issue by far
到目前为止，经济是头等大事。
The last of these reasons is by far the most important.
这些理由中最后一条比其他的重要得多。
It was by far the worst speech he had ever made.
这是他迄今发表过的最差的演讲。
I agree with you that the open system is by far the best
我同意你的观点，开放的系统显然是最佳的。
His third album is by far his most interesting.
他的第三张专辑是迄今最有味道的。
This applicant is by far the better than that one.
这个申请者远比那一个好。
We'll go by train as far as London, and then take a bus.
我们坐火车到伦敦，然后转乘公共汽车。
二、so far的意思及用法
so far意为目前为止;(只能到)如此程度;这个地步;迄今为止。
例句：How many driving lessons have you had so far?
你到目前为止上过多少节驾驶课了？
I've only read a little of the book so far.
这本书我才读了一小部分。
They have not had a win so far this season.
他们这一赛季迄今还没有赢过一场。
So far I have had no luck with finding a job.
我找工作一直不走运。
All talks have so far been conducted through an intermediary.
到目前为止所有的谈判都是通过调停人进行的。
