particle N5 common casual

〜の — sentence-final の: explanatory tone or soft question

〜の・の

Meaning

casual sentence-final の — softly asks for or gives an explanation (the spoken, bare form of のだ/んです)

Key sentence

どうして泣ないているの？

Why are you crying?

Formation

Attaches to	Form	Example
Verb / i-adjective (plain form)	plain + の	行いく → 行いくの？
Noun / na-adjective	N/na-adj + なの	学生がくせい → 学生がくせいなの

When: Casual speech only. Rising intonation = a gentle question (どうしたの？); falling = a soft explanation. The falling-tone statement form sounds notably feminine; men more often use んだ.

Examples

明日あした、試験しけんがあるの。

(The thing is,) I have an exam tomorrow.

もう帰かえるの？

Are you leaving already?

調子ちょうしが悪わるいの。

I'm not feeling well.

Easily confused with

のだ / んだ This 〜の is just のだ with the だ dropped — same explanatory function, lighter and more conversational. 痛いたいの = 痛いたいんだ. Adding か is unnecessary: 行いくの？ already asks the question.

Notes

Don't tag の onto every casual sentence — like のだ, it implies there's a reason or circumstance behind the statement, not a flat report.

See 〜の in real sentences

Jengo shows 〜の the way you actually meet it: inside real Japanese sentences, so it sticks instead of staying an abstract rule.

Study it in Jengo

Sources Compiled with reference to A Dictionary of Basic Japanese Grammar.

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