Meaning & usage
ので gives a reason in the sense of since or because, presenting the cause as background for what follows. It attaches to the plain form of verbs and i-adjectives, as in 降ったので and 寒いので, and to nouns and na-adjectives with な, as in 日曜日なので and 静かなので. It sounds softer and more polite than から, so it is common in polite explanations and requests.
Example sentences 8
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雨がひどく降ったのでグラウンドはぐしゃぐしゃだ。
It rained heavily, so the playground is muddy.
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すっぴんは恥ずかしいのであまり見ないで下さい。
It's embarrassing to be seen without make-up so please don't stare.
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つかれたので、はやくねます。
Since I'm tired, I'll go to bed early.
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おなかがすいたので、ごはんをたべます。
Since I'm hungry, I'll eat a meal.
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さむいので、コートをきます。
Since it's cold, I'll wear a coat.
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あたまがいたいので、くすりをのみます。
Since I have a headache, I'll take some medicine.
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へやがしずかなのでよくねられます。
Since the room is quiet, I can sleep well.
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にちようびなのでデパートはこみます。
Since it's Sunday, the department store is crowded.
In past JLPT papers
This came up in 28 past exam questions.
And 22 more tests.