As far as means “to the extent that”: as far as I know means “from what I know, though I may be wrong”. About distance, it means “up to a place”: as far as the station means all the way to the station. With is concerned, it means “regarding”: this is how you introduce a new topic in an essay or a business letter.
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as far as I know/remember/can see; as far as + noun + is/are concerned; as far as + place
- As far as I know, the library is closed on public holidays.
- As far as public transport is concerned, the city has improved a lot in recent years.
- We walked as far as the old lighthouse and then took a taxi back.
What changed
First versionAs far as the price, it is quite reasonable for a four-star hotel.
RevisionAs far as the price is concerned, it is quite reasonable for a four-star hotel.
It is tempting to end the phrase right after as far as the price. But when it means “regarding”, as far as must be followed by a full clause with its own verb: as far as the price is concerned or as far as the price goes. So is concerned was added. For a shorter version, use as for: As for the price, it is quite reasonable.
As long as means something completely different, “on condition that”: You can borrow my bike as long as you bring it back by Sunday. People mix them up because they start the same way, but nobody says as long as I know. To give your opinion in an essay, you can use as far as I am concerned, meaning “in my opinion”, but if you use it in every paragraph, it quickly becomes tiresome, and a simple In my view works just as well.
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___ I know, the museum is closed on Mondays, so let's go on Tuesday instead.
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As far as — The speaker isn't sure and is relying on what they know, so the answer is As far as I know. As long as introduces a condition, “on condition that”, and doesn't go with I know.
Write a review of a hotel or flat you stayed in. Use as far as … is concerned to rate one aspect, such as the location or the noise, and explain your rating.
As far as the location is concerned, the flat was perfect: the metro was two minutes away and there was a park across the road.
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