Learn English – Which is correct: “So far as I know” or “As far as I know”


Which is more appropriate: "So" or "As"?

Best Answer

Both are equally valid because as far as and so far as have exactly the same meaning in this context. However, so far as may be considered a slightly less formal version of in so far as.

as far as
to the extent that:
as far as I am concerned, it is no big deal

(in) so far as
to the extent that:
it was a windless storm so far as blizzards go


However, you will likely more often hear as far as I know in casual conversation. For the extremely formal, in so far as I/we know would not be out of place.

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