のだ, んだ
Expression, See のです, の and ん add emphasis
the expectation is that ..., the reason is that ..., the fact is that ..., the explanation is that ..., it is that ...
違うんだ。
んだ
Interjection, Dialect: Touhoku-ben
that's right, yes, uh-huh
あいつは気が利くんだ。
よ
Particle, at sentence-end; indicates certainty, emphasis, contempt, request, warning, etc.
1. hey, you
after a noun; used when calling out to someone
2. hey
in mid-sentence; used to catch one's breath or get someone's attention
3. hey, hold on
Interjection
4. yo, hey