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Grammar Book

GrammarBook N5: ~んです (Explanatory Tone)

  • 01 Feb, 2026
  • Com 0
N5-G-058

~んです (Explanatory Tone)

Supporting / Reasoning

👀 Layer A: Visual Guide (直感理解)

📝 Quick Summary (まとめ)

単なる事実ではなく、「実は~なんです」と事情(じじょう)を説明したいときに使います。理由を言ったり、言い訳をしたりするときに便利です。
Use “N desu” to add an explanatory tone (“The thing is…”, “Actually…”). It conveys that you are giving a reason or explaining the background of a situation.

Structure: [Plain Form] + んです。
Noun/Na-adj: [Noun] + な + んです。

🔗 Connected Grammar (関連文法):

  • N5-G-056: ~からです (Because – Direct Reason)
  • N5-G-057: ~ので (Because – Polite Reason)

🔍 Layer B: Deepening (深掘り)

💡 Raya’s Hack (攻略法)

「んです」=「のです」の話し言葉!
教科書では「~のです」と書いてあることもありますが、「~んです」は会話で使う形です。
* 書くとき:行かないのです。
* 話すとき:行かないんです。
会話では「ん」を使いましょう!

“N desu” is the spoken version of “No desu”. In writing, you might see “No desu”, but in conversation, always shorten it to “N desu”.

🚧 Joy’s Mistake (よくある間違い)

Scene: Joy introduces himself at a party.

Joy: 「はじめまして。私は ジョイなんです。」
(Hajimemashite. Watashi wa Joy na n desu.)

❌ Unnatural!

Why?

ただの事実(名前など)を言うときに「んです」を使うと、「実はジョイなんです(秘密でしたけど)」のような変な意味になります。
自己紹介は普通に「ジョイです」と言いましょう。

Don’t use “N desu” for simple facts. It sounds like you are revealing a secret or implying a hidden meaning. For introductions, just use “Desu”.

🔥 Layer C: Practice Loop

Now it’s time to test your learning through the next 10 practice drills!

Level 1: Connect to N-desu

Q1. I go (Iku) -> (N desu)
答え: 行くんです (Iku n desu)

(Verb Dict + n desu)

Q2. I went (Itta) -> (N desu)
答え: 行ったんです (Itta n desu)

(Verb Ta + n desu)

Q3. It’s expensive (Takai) -> (N desu)
答え: 高いんです (Takai n desu)

(i-adj + n desu)

Q4. I like it (Suki) -> (N desu)
答え: 好きなのです (Suki NA n desu)

(Na-adj + NA + n desu)

Q5. It’s a cold (Kaze) -> (N desu)
答え: 風邪なのです (Kaze NA n desu)

(Noun + NA + n desu)

Level 2: Explaining Situations

Q6. (Why are you eating?) “I’m hungry.” (Onaka ga suita)
答え: お腹が 空いたんです。

(Onaka ga suita n desu. *Explaining the reason*)

Q7. (Why don’t you buy it?) “It’s expensive.” (Takai)
答え: 高いんです。

(Takai n desu. *Implies: That’s why I won’t buy it*)

Q8. (Why are you late?) “The bus didn’t come.” (Bus ga konakatta)
答え: バスが 来なかったんです。

(Konakatta n desu. *Excuse*)

Q9. (Where are you going?) “I’m going to the convenience store.” (Konbini e iku)
答え: コンビニへ 行くんです。

(Iku n desu. *Explaining current action*)

Q10. Translate: “Why are you crying?” (Doushite naite iru?)
答え: どうして 泣いて(い)るんですか?

(Doushite naite iru n desu ka? *Asking for explanation*)


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Related posts:

GrammarBook N5 : AはBです (A is B) GrammarBook N5: The Particle も (also) GrammarBook N5: い-adjectives GrammarBook N5: ~たいです
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GrammarBook N5: ~ので (Because - Polite)
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