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According to jmdict 曲がる is intransitive, therefore it should be used with が or
は. However it always seems to be used with を - for example:
この道を行って二つ目の角を右に曲がります。
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2012-05-03T07:15:13.217
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2012-05-07T02:30:00.677
2012-05-07T02:30:00.677
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particles
In which situations is が used with 曲がる?
That sentence basically boils down to `（私・あなた・someone）（は・が）...角を曲がります。`
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2012-05-03T14:25:44.007
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2012-05-03T14:25:44.007
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This is related to a pattern with "motion verbs" in Japanese that are
considered to be intransitive, but still use を to describe the area that the
motion goes through.

From the first part of your example, この道を行って, the を in this case marks the
area or thing through which the subjects 'goes', even though it's not a
transitive verb. Often this use of を can be described as "along X" or "through
X", and often carries the implication of moving along or through either all or
a significant portion of the area described with を.

The same is true of 曲がります in your example, and it means something like "turn
through that corner". Another example would be 飛行機が空を飛ぶ.

が simply marks the subject of the sentence, the thing that is moving through
the corner or along the street, or through the sky. (I suspect your question
title meant to reference を instead of が, however, given that your example
sentence does not contain the particle が)
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2012-05-03T15:11:50.393
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2012-05-03T15:17:21.243
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The reason here is very simple.

The 角 is not what is doing/being 曲がる, 角 is simply the medium that the action
is being preformed through.

Take the following similar example, 電車{でんしゃ}が線路{せんろ}を走{はし}る.

As in my example, your sentence has the car/driver/etc doing the action, while
the conner, road, etc is what is being acted on.
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2012-05-04T02:26:56.600
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