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Grammar Book

GrammarBook N5: ~ので (Because – Polite)

  • 01 Feb, 2026
  • Com 0
N5-G-057

~ので (Because – Polite)

Supporting / Reasoning

👀 Layer A: Visual Guide (直感理解)

📝 Quick Summary (まとめ)

「から (Kara)」よりも丁寧で柔らかい理由の言い方です。言い訳をするときや、目上の人に説明するときによく使います。
Use “Node” to state a reason politely. It is softer than “Kara” and is preferred when making excuses, asking favors, or speaking to superiors.

Verb/i-adj: [Plain Form] + ので。
Noun/na-adj: [Noun] + な + ので。

🔗 Connected Grammar (関連文法):

  • N5-G-056: ~からです (Because – Direct)
  • N5-G-049: Plain Present Form (Base for connection)

🔍 Layer B: Deepening (深掘り)

💡 Raya’s Hack (攻略法)

「名詞」と「な形容詞」は「な (NA)」でつなぐ!
「から」と「ので」の最大の違いはここです。
* 好き だ から (Suki DA kara)
* 好き な ので (Suki NA node)
「ので」は音が柔らかいので、強い「だ (DA)」ではなく、優しい「な (NA)」を使います。リズムで覚えましょう!

For Nouns and Na-adjectives, change “DA” to “NA” before “Node”. “Kara” uses “Da”, but “Node” uses “Na”. “Suki NA node”. Memorize this rhythm!

🚧 Joy’s Mistake (よくある間違い)

Scene: Joy is late because of rain.

Joy: 「雨だので、遅れました。」
(Ame da node, okuremashita.)

❌ Grammar Error!

Why?

「だ (DA)」と「ので (NODE)」は一緒に使えません。
正解は「雨 な ので (Ame NA node)」です。

You cannot use “DA” with “Node”. You must switch “DA” to “NA”. Correct: “Ame NA node”.

🔥 Layer C: Practice Loop

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

Level 1: Connect with Node

Q1. It’s hot (Atsui) -> (Node)
答え: 暑いので (Atsui node)

(i-adj + node)

Q2. I go (Iku) -> (Node)
答え: 行くので (Iku node)

(Verb dict + node)

Q3. It’s Sunday (Nichiyoubi) -> (Node)
答え: 日曜日なので (Nichiyoubi NA node)

(Noun + NA + node)

Q4. I like it (Suki) -> (Node)
答え: 好きなので (Suki NA node)

(Na-adj + NA + node)

Q5. I don’t go (Ikanai) -> (Node)
答え: 行かないので (Ikanai node)

(Nai-form + node)

Level 2: Polite Reasons

Q6. “Because I have a cold, I will rest.” (Kaze, Yasumu)
答え: 風邪なので、休みます。

(Kaze NA node, yasumimasu.)

Q7. “Because the bus didn’t come, I was late.” (Konai, Okureru)
答え: バスが 来なかったので、遅れました。

(Konakatta node… *Past negative + node*)

Q8. “Because I don’t have money, I can’t buy it.” (Nai, Kaemasen)
答え: お金が ないので、買えません。

(Nai node…)

Q9. “It’s dangerous, so please stop.” (Abunai, Yameru)
答え: 危ないので、やめてください。

(Abunai node…)

Q10. Translate: “Since I have an errand, (I will go home/excuse myself)…” (Youji)
答え: 用事があるので…。

(Youji ga aru node… *Trailing off is polite*)


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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: ~からです (Because / Reason)
GrammarBook N5: ~んです (Explanatory Tone)
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