Grammar Info
N5 Lesson 5: 2/12

ので
Because, So, Since, The reason being

Structure
Verb + ので + Phrase
[い]Adjective + ので + Phrase
[な]Adjective + + ので + Phrase
Noun + + ので + Phrase
Details
Part of Speech Particle
Word Type Conjunctive Particle
Register Standard
品詞 助詞
単語の種類 接続助詞
使用域 一般
Information
ので is a Japanese grammar structure called a conjunction particle. This means that it connects two parts of a sentence ‘logically’. The connection that ので makes between (A), and (B), is similar to から, meaning that it is often translated as ‘because’, or ‘since’.
When used after な-Adjectives or nouns, な must precede ので.
  • 今日(きょう)日曜日(にちようび)ので休(やす)みです
    Since it's Sunday today, It’s a day off.
  • 友達(ともだち)家(いえ)来(く)るので、部屋(へや)掃除(そうじ)する
    Since my friend is coming to my house, I will clean my room.
  • 景色(けしき)綺麗(きれい)ので、写真(しゃしん)撮(と)ります
    Since the scenery is beautiful, I will take a picture.
  • 今日(きょう)寒(さむ)ので、コート着(き)ます
    Since it is cold today, I will wear a coat.
When used as ‘since’, ので puts emphasis on the sentence as a whole, and examines reasons objectively (in a way that is based on facts, rather than feelings or opinions). から tends to be more subjective, and can sound much more vague when used as ‘because’.
  • 私(わたし)弱(よわ)ので、ジムへ行(い)きます
    I go to the gym because I am weak. (Being that I am weak)
  • 野菜(やさい)嫌(きら)いから、食(た)べません
    I don't eat vegetables because I don't like them. (From that vegetables are disliked)
We can see here that から is not quite as strong as ので. This relates back to the base meaning of から being ‘from’, rather than ‘because’.
Caution
ので can sometimes be seen as んで, which is a more casual variation. Also, unlike many grammar points that connect to verbs, ので may be used with the ます form. This is something that is unique to conjunction particles.
  • 今(いま)テストがあるんで、後(あと)で電話(でんわ)します
    Because I have a test now, I will call you later.
  • 明日(あした)お客(きゃく)来(き)ますので、掃除(そうじ)します
    Since a guest is coming tomorrow, I am going to clean.
Slow Male
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私(わたし)寿司(すし) 好(す)きではないので食(た)べない
I don’t like sushi, so I don’t eat it.
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今日(きょう)時間(じかん)がないので明日(あした)漢字(かんじ)教(おし)えます
Because we don’t have time today, I will teach you kanji tomorrow.
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今日(きょう)先生(せんせい)休(やす)ので授業(じゅぎょう)なくなった
Since the teacher has the day off today, classes were cancelled.
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Books
Genki I
Page 232
Genki I 2nd Edition
Page 273
みんなの日本語 II
Page 90 [CH 39]
みんなの日本語 II
Page 150 [CH 49]
Marugoto Elementary 2 (A2) Rikai
Page 40
[DBJG] A Dictionary of Basic Japanese Grammar
Page 328
Tae Kim's Japanese Grammar Guide
Page 108