as long asとas far as の意味と使い方の違い

as long as , as far as はどちらも『~する限り』と日本語に訳しますが、意味と使い方が異なります。


as long as , as far as どちらにも接続詞、同等比較として使うことが出来ます。まずは接続詞から見て行きましょう。

接続詞 as long as の意味と使い方

接続詞 as long as には2つの意味があります。

1.時間の範囲 『~している間は』

used to say that one thing will continue if another thing happens at the same time.

I will not forget you as long as I am alive.

Please stay as long as you wish.


used to say that one thing can happen if another thing happens

You can have a cat as long as you promise to take care of it.

Any hotel will do as long as the cost is low.

接続詞 as far as の意味と使い方

接続詞 as far as の意味は、『ある範囲においては』という意味です。

used to say that an idea, suggestion, plan etc is satisfactory, but only to a limited degree


As far as I know, he is a engineer.

As far as I remember, he smoked.

As far as I am concerned, this is the best way.

As far as I can tell, he was not happy here.

There was nothing but the ocean as far as the eye could see.


as ~ as  ~に形容詞か副詞を入れることで『同じ~』という意味になります。~には long も far も入れることが出来ます。

A is as long as B『AはBと同じ長さです』

A is as far as B『AはBと同じ距離です』


This pen is as long as that one.

The distance between my and the station is as far as my house and my company.