I would like to ask you a question about the usage of んだ. I know that it can
be used to explain a situation, but I have noticed it can be used to bring up
a topic as well, is it true? I heard the following sentence: 仕事やめたんだ In this
case I do not think んだ is used to explain a situation because the speakers
were talking about a totally different topic. Also, what is the difference
between 仕事やめたんだ and 仕事やめた when you want to bring up a topic?

Thank you in advance!
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2015-12-23T10:23:11.143
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2015-12-23T22:06:14.767
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grammar
「んだ」の使い方について質問させていただきます
My dictionary says 「のだ、のです」 is used as the method of representing "explain"
and "judgement" including own feeling.

I think 仕事をやめた focus the fact and 仕事をやめたんだ focus more own feeling. In
addition, 「んだ、んです」 is a euphonic changes of 「のだ、のです」.
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2015-12-23T12:15:53.797
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2015-12-23T12:32:58.747
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んだ/のだ is used give a supplemental explanation (補足説明{ほそくせつめい})- it is an
explanation but not always necessary.

> (Xは)仕事{しごと}をやめた。(X depends on the context)

This is describing only the fact that X has quit a job. This is just a
statement by the speaker, there is no nuance that the speaker is giving an
explanation.

> (Xは)仕事{しごと}をやめたんだ。

Using んだ/のだ to '仕事{しごと}をやめた' creates a nuance that the speaker would like to
tell the story about why or how X quit the job. This is a big difference from
から (e.g. 仕事{しごと}をやめたから) which is normally used to explain a situation.
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2015-12-23T15:34:42.080
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2015-12-23T15:34:42.080
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I always see んだ used with definitive, almost bossy sentences. Like the speaker
really wants the listener to know how they feel. So, with respect to what
everyone else has said, I would agree. The explanation is given as though a
question was asked. Kind of like how a friend will say to you one day out of
the blue, "I just quit my job." Naturally, you're going to ask, "Why?" or at
least for explanation.

Make more sense?
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2015-12-23T22:06:14.767
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2015-12-23T22:06:14.767
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