N5 Lesson 2: 8/9
~んです・のです ~んだ・のだ

~んです・のです

explanatory
explaining
emphasis
the fact is

⚠ ん is casual variant that evolved from の due to being easier to pronounce. Therefore some consider の to be "stiff" when used in casual (and even in polite) conversations.

Structure Legend
Structure
CasualPolite
Verb + (1) +
[い]Adjective + (1) +
[な]Adjective + + (1) +
Noun + + (1) +

(1)
[When paired with the question particle か, んです・のです implies that the speaker is seeking further explanation from the listener]

[The casual んだ or のだ are also acceptable unless だ comes before the questions particle か at the end of a sentence]

[In casual speech だ・です can be dropped entirely (e.g. いいの?, あるの?, etc.)]

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いいんです
Reload
Slow
Normal
Is it good?
[asking for explanation・explaining・emphasis]

Genki I : Page 230
Genki I 2nd Edition : Page 270
[DBJG] A Dictionary of Basic Japanese Grammar : Page 325
みんなの日本語 II : Page 12 [CH 26]
Marugoto Elementary 1 (A2) Rikai : Page 154
[DBJG] A Dictionary of Basic Japanese Grammar : Page 322
Tae Kim's Japanese Grammar Guide : Page 73