As far as [From what] I can make out, he is guilty.
私が知る限りでは彼はクロだ
As far as I can see it is not technically possible.
私の理解する限りではそれは技術的に不可能だ
as far as I know
私の知る限り
as far as I know [I can remember]
((略式))私の知るかぎりでは
as far as that goes [that is concerned]
((略式))そのことについて言えば（◆主節が否定文の場合so far asが好まれる）
as far as the eye can see [reach]
見渡すかぎり
As far as the quality is concerned, it's perfect.
質に関する限り完ぺきだ
as far as we can see
見渡す限り
as far back as 1550
１５５０年という昔に（早くも）
as fate would have it
運悪くも
