JLPT N4 reference · Clauses and connections

から and ので

Both give reasons, but から often sounds more speaker-driven while ので commonly presents a contextual explanation.

Core meaning and form

Attach から or ので to a reason clause; nouns and な-adjectives use だから but なので. The difference is a tendency rather than a fixed polite-versus-rude rule.

Form: Attach から or ので to a reason clause; nouns and な-adjectives use だから but なので.
Core use: Both give reasons, but から often sounds more speaker-driven while ので commonly presents a contextual explanation.
Context: The difference is a tendency rather than a fixed polite-versus-rude rule.

雨だから、出かけません。Ame da kara, dekakemasen.I am not going out because it is raining.

電車が遅れたので、遅刻しました。Densha ga okureta node, chikoku shimashita.I was late because the train was delayed.

忙しいから、後で電話します。Isogashii kara, ato de denwa shimasu.I am busy, so I will call later.

Do not select this pattern from an English translation alone; check its attachment and discourse function.
Keep the surrounding sentence in a consistent plain, polite, spoken, or written register.

Attach から or ので to a reason clause; nouns and な-adjectives use だから but なので.
Both give reasons, but から often sounds more speaker-driven while ので commonly presents a contextual explanation.
The difference is a tendency rather than a fixed polite-versus-rude rule.