So far 和 until now的分別

so far = up to now
so far =/= until now

Until implies that an opposite situation has occurred against the period before that suggested by "until".

In this sense, the sentence
Until now I have been to Stockholm, Berlin and Rome.
does not make sense.

What can possibly be the opposite of "have been to Stockholm, etc."? I can't think of a possible scenario to the situation.

So far I have been to Stockholm, Berlin and Rome.
= Up to now I have been to Stockholm, Berlin and Rome.
but not "until now"


I did not know much about his work so far.
Now I still do not know much about his work.

I did not know much about his work until now.
Now I know more about his work.

so far 可以解作「咁耐以來」，until now 可以解釋為「到目前為止」，所以前者有繼續嘅意思，後者表示已經停止。