Translation guide
A guide to expressing the English phrase 'so far as' in Japanese, covering its use in limiting scope, expressing extent, and in fixed phrases.
Expressing that something is true only within certain limits or to a certain degree.
Used to say 'as far as A is concerned, B'. A is a noun or a clause indicating the source or scope of information.
So far as I know, he is innocent.
So far as the weather forecast goes, it will rain tomorrow.
More formal, meaning 'as far as A is concerned'. A is a noun.
Similar to かぎりでは, but slightly more formal or literary. A is a noun.
So far as my memory goes, such a thing did not happen.
Expressing that one will do something to the maximum extent possible.
Means 'as much as possible' or 'to the fullest extent'. Often used with verbs.
Please come as soon as possible.
Expressing that one action or state is true only to the extent that another is true.
Means 'as long as A is the case, B'. A is a verb or adjective in dictionary form or negative form.
So far as we are alive, there is hope.
The common English phrase used to qualify a statement based on one's knowledge.
Direct equivalent, used in both spoken and written Japanese.
Use かぎり for conditional 'as long as' or 'to the extent that'. Use 限りでは when limiting the scope of a statement based on a source of information (e.g., 'as far as I know').
So far as you make an effort, you will succeed.
So far as this problem is concerned, a solution has not yet been found.
I will do everything I can.
Means 'as much as possible' or 'if possible'. Slightly less formal than できるかぎり.
Please be as quiet as possible.
Formal expression meaning 'as far as possible'.
We will respond as soon as possible.
The game will be held so far as it doesn't rain.
Means 'since A is the case, B naturally follows'. Often used for logical consequences.
So far as you have promised, you must keep it.
So far as I know, he hasn't arrived yet.
Slightly more conversational variant.
So far as I know, there shouldn't be a problem.
私の知る限りでは、彼は来ない。
So far as I know, he won't come.
Do not translate 'so far as' word-for-word into Japanese. Phrases like 'その程度まで' are unnatural. Use the patterns above instead.
I'll help you so far as I can.