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X and Y are in a forest. They have been talking about it getting dark and
cold. They both know that it is a long walk out of the forest.

「これから長いことと歩かなければいかん」Xは指摘した。「２日間もです。もしかしたら３日かも。もう **日が暮れ** かかっています」  
Yは空を見やった。「毎日このくらいの時間になれば **日が暮れる** 。暗くなるのが怖い、X?」 この挑発に、Xは乗らなかった。......

  1. Thus far, the verb "暮れる" has not been used.
  2. "暗くなっている" _has_ been used.
  3. "日が暗くなっている" _has never_ been used.

Surely, #3 demonstrates that "暗くなっている" and "暮れている" are different in nuance.
And, that is fine, a different issue.

> Given context, can't you assume the "日" in "日が暮れている"?

We already know it is getting cold / dark / late.  
It is said twice in a row.  
And, Y says it while he is looking at the sky.

(wild guess): "日が" places emphasis on the sun. This emphasis allows you to
capture the sun's practical, and symbolic, meanings?
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2015-08-11T17:22:20.297
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2015-08-11T19:24:06.297
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question
translation particle-が
With context that it is getting dark, why say "日が暮れる" instead of just "暮れる"?
暮れる alone can mean 'a day ends' or 'the sun sets' but 日 usually accompanies
it. I don't think '日が' have any implications here.

暮れる actually means 'a day, a month, a season or a year ends'. We say
'今年も暮れますね' in December.
CC BY-SA 3.0
2015-08-11T19:24:06.297
27340
2015-08-11T19:24:06.297
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answer