〜んです (casual) and 〜のです (formal) add explanatory or emotional nuance. One of the most common patterns in spoken Japanese.
Giving explanations - Providing background context or reasons
Seeking explanations - Asking "why" with genuine curiosity
Emotional emphasis - Adding weight to statements
What's wrong? (I noticed something)
Attaches to plain forms. For な-adjectives and nouns, add な before んです.
な-adjectives/nouns need な
- ✅ 静かなんです、学生なんです
- ❌ 静かんです、学生んです
Don't overuse — only when explaining or emphasizing, not for simple facts
んです = casual, のです = formal/written
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