Translation guide
The English word "so" has many functions: showing result, degree, purpose, connecting ideas, and more. This guide breaks down each use and gives natural Japanese equivalents.
Expressing a consequence or logical conclusion
The most common way to say 'so' as a result. Used in both spoken and written Japanese.
雨が降っている。だから、出かけない。
It's raining, so I won't go out.
Polite or formal 'so'. Often used after nouns or na-adjectives, or as a softer connector.
明日は休みです。なので、遅くまで起きていられます。
Tomorrow is a day off, so I can stay up late.
Formal, written 'therefore'. Used in academic or business contexts.
このデータは不十分である。したがって、結論を出すのは難しい。
This data is insufficient; therefore, it is difficult to draw a conclusion.
Expressing extent or intensity leading to a result
Pattern: 'so [adjective/adverb] that...'. とても means 'very', and ので gives the reason/result.
とても疲れたので、すぐ寝た。
I was so tired that I went to bed immediately.
Emphasizes an excessive degree. 'So... that...' with a nuance of 'too much'.
あまりにも暑いので、エアコンをつけた。
It was so hot that I turned on the air conditioner.
Attach to verb stem or adjective stem to mean 'so... that (negative result)'. Casual.
食べすぎてお腹が痛い。
I ate so much that my stomach hurts.
Expressing intention or goal
Used after verbs to mean 'so that'. Often with potential or negative form.
忘れないようにメモした。
I took a note so that I wouldn't forget.
Used with volitional verbs to express purpose. More direct intention than ように.
日本語を勉強するために日本に行った。
I went to Japan so that I could study Japanese.
Continuing a story or explanation
Casual connector meaning 'and so' or 'and then'. Used in conversation.
昨日は飲み会だった。それで、今日は二日酔いだ。
I had a drinking party yesterday, and so I have a hangover today.
More neutral 'and then'. Can also mean 'and' in lists.
Intensifying an adjective or adverb
Very common casual intensifier. 'So' as in 'so good'.
このラーメン、すごくおいしい！
This ramen is so delicious!
Standard 'very'. Slightly more formal than すごく.
とても嬉しいです。
I'm so happy.
Very casual, slangy 'so'. Common among younger speakers.
めっちゃ疲れた。
I'm so tired.
Showing understanding or confirmation
Polite 'Is that so?' or 'I see'. Used to acknowledge information.
A: 明日は休みです。B: そうですか。
A: Tomorrow is a day off. B: Is that so?
Casual 'Oh, I see' or 'Is that so?'. Shows interest.
A: 彼女ができたんだ。B: そうなんだ！
A: I got a girlfriend. B: Oh, really!
Giving an approximate amount
Expressing similarity or addition
Particle meaning 'also' or 'too'. Used in 'so do I' constructions.
私も行きます。
I'll go too. / So will I.
Literally 'me too' or 'so am I'. Polite.
A: 疲れました。B: 私もそうです。
A: I'm tired. B: So am I.
English uses 'so' as a filler or discourse marker ('So, I was thinking...'). In Japanese, starting a sentence with だから or それで can sound abrupt. Often it's better to omit it or use a softer connector like あのう or ええと.
あのう、ちょっと質問があるんですが。
So, I have a question.
だから is casual and direct; なので is softer and more polite. In formal writing, したがって or そのため are preferred.
He stood up, and then began to speak.