Explaining Reasons: kara vs node｜から・ので
Both 〜から and 〜ので express reasons and causes, but their tone and social nuance are quite different. Use 〜から when stating personal opinions, invitations, or strong convictions. Use 〜ので when offering polite, objective explanations, especially in business or when speaking to superiors. Practise with realistic everyday and workplace scenarios.
どうしてですか。理由を言うときに『から』と『ので』を使います。丁寧さや使う場面の違いを練習しましょう。
Expressing personal views: 〜から
〜から presents a reason based on personal judgment, feeling, or conviction. It sounds direct and lively. You can naturally follow it with suggestions, invitations, orders, or personal thoughts (e.g. 〜ましょう, 〜てください).
『から』は自分の気持ちや考えをはっきりと伝えます。友だちを誘うときや、お願いするときによく使われます。
Offering polite, objective reasons: 〜ので
〜ので presents the reason as an objective fact or natural circumstance rather than personal assertiveness. It softens the statement, creating a polite, respectful atmosphere suitable for business emails, talking to customers, or apologising.
『ので』は事実をそのまま丁寧に説明します。仕事や目上の人と話すときにぴったりです。
Grammar connections
Before 〜から: plain form or polite form (寒いから／寒いですから). Before 〜ので: plain form (寒かったので); for nouns and na-adjectives in present tense, replace だ with な (雨なので／静かなので).
『から』の前は普通形でも丁寧形でも使えます。『ので』の前に名詞がくるときは、『雨なので』のように『な』をつけます。
Which should you choose?
In general, choose 〜ので when giving an excuse, explaining a delay at work, or making a polite request to someone you do not know well. Choose 〜から for casual conversations with friends or when urging someone to take an action.
遅刻の連絡やおわびには『ので』が適しています。親しい人との日常会話では『から』がよく使われます。
Examples / 例
The following scenes and exercises were written for this lesson. They do not describe an actual service or event.
雨が降っていますから、傘を持っていきましょう。
Because it is raining, let's take an umbrella.
The speaker suggests an action based on personal observation.
電車が遅れたので、少し遅刻します。
Because the train was delayed, I will be a little late.
The speaker politely explains an objective reason for being late.
この料理はおいしいですから、食べてみてください。
This dish is delicious, so please try some.
A friendly recommendation urging the listener to try the food.
体調が悪いので、今日は早く帰ってもいいですか。
Because I am not feeling well, may I go home early today?
A polite request at the workplace stating an objective health reason.
Practice / 練習
Read each situation. Say your answer before opening “Answer and explanation.”
Q1. You explain to your workplace manager why you were delayed by traffic: バスが（遅れたから／遅れたので）、遅くなってしまいました。
Answer and explanation
遅れたので
Use 〜ので in the workplace to provide a polite, objective explanation.
Q2. You casually invite a friend to eat: とてもおいしい（から／ので）、いっしょに食べよう！
Answer and explanation
から
〜から fits casual invitations and personal recommendations naturally.
Q3. Complete the connection with the noun 雨 (rain) and ので: 雨（だので／なので）、試合は中止です。
Answer and explanation
なので
Nouns and na-adjectives attach to ので with な (雨なので).
Q4. Which ending sounds more considerate and softer when apologising to a customer?
Answer and explanation
ので
〜ので sounds softer and more objective, making it the preferred choice for customer communication.
Words / 言葉
| Japanese | English |
|---|---|
| 理由 | reason; cause |
| 遅刻 | tardiness; being late |
| 体調 | physical condition; health |
| 丁寧 | polite; courteous |
| 傘 | umbrella |
A phrase to use
電車が遅れたので、10分ほど遅れます。
Because the train was delayed, I will be about 10 minutes late.
Sources
Grammar reference: The Japan Foundation, Irodori: Japanese for Life in Japan. The explanations here are concise original summaries; examples and practice questions are original.
- Elementary 1, Lesson 3, grammar notes, printed page(s) 15 (PDF)
- Elementary 2, Lesson 3, grammar notes, printed page(s) 21 (PDF)
Official Irodori Elementary 1 download page · Official Irodori Elementary 2 download page