by far可以修饰比较级和最高级。如果比较级或最高级前有定冠词the，by far置于前后均可，但通常要置于不带定冠词the 的比较级后面，也可前置。一般作表示程度或一种语气。

It was by far the worst team he had ever joined.

这是他迄今参加过的最差的团队。

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。

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。

He is by far the best player on the team. 他是这个队最优秀的队员。

I agree with you that the experience of online shopping is by far the best.

我同意你的观点,网上购物的体验迄今为止是最佳的。

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。

By far the most important issue for them is unemployment

对他们来说最重要的无疑就是失业问题。
His third album is by far his most interesting.

他的第三张专辑是迄今最有味道的。

'Dottie' is by far his best novel to date

《多蒂》是他迄今为止最好的小说。

It is by far the best choice. 这是最好的选择。

This is the best way by far. 这是最好的方法。

That is by far the tallest building in the city.

那是这座城市里最高的建筑物。

She is by far the better actress/the better actress by far. 她是个更为优秀的女演员。

Your paper is by far the better of the two. 两篇论文中你的要好得多。（本句中有表示范围的of短语，by far应前置）

Her explanation is clearer by far. 她的解释清楚得多。

She sings by far better than others. 她唱得比别人好得多。

This safety device is by far better than that.

这个安全装置比那个要好得多。

注意：

1. 另外by far用在比较级前面时,也可以把by省去,同样是
“ …得多”的意思。例如:
She speaks English far better than I.

她的英语讲得比我好得多。

It was better by far to be clear-headed.

保持头脑清醒要好得多。

This applicant is by far the better than that one.

这个申请者远比那一个好。

2.so far是个副词词组,用于作时间状语,意思是“到目前为止”、“迄今，至今”,所在句子常用现在完成时态。例如
How many driving lessons have you had so far?

你到目前为止上过多少节驾驶课了？

What do you think of the show so far?

到目前为止你觉得这场演出怎么样？

So far we have built four oil fields.

到目前为止,我们已经建立了四个油田。 I haven't heard from him so far.

我至今没有收到他的信息。

How many driving lessons have you had so far?

你到目前为止上过多少节驾驶课了？

So far, the police investigation has drawn a blank.

到目前为止警方的调查毫无结果。

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。

I've saved almost £ 100 so far.

我至今已经攒了差不多100英镑了。

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。

The police have so far failed to track down the attacker.

警方至今未能追捕到攻击者。

He has written only a skeletal plot for the book so far.

那本书他目前只写了一个情节梗概。