の
Meaning
Sentence-final の (rising intonation) makes a casual question. It often asks for an explanation or confirmation: "…?" / "Is it that…?"
Conjugation
Vる/Vた/Vない (plain form) + の: Aい + の
Examples
Show translation
お父さん、いつ帰ってくるの？ 会いたいなあ。
ご飯をもう食べたの？
娘さんはどこにいるの？
その本は面白いの？
友達は元気なの？
明日は休みなの？
grammarDetailPage.commonMistakes.title
grammarDetailPage.commonMistakes.wrong: あなたは学生だの？
grammarDetailPage.commonMistakes.correct: あなたは学生なの？
grammarDetailPage.commonMistakes.why: After a noun or a な-adjective, the question uses なの, not だの.
grammarDetailPage.commonMistakes.wrong: もう食べましたの？
grammarDetailPage.commonMistakes.correct: もう食べたの？ / もう食べましたか？
grammarDetailPage.commonMistakes.why: の questions attach to the plain form. Use ます-form only with か.
grammarDetailPage.commonMistakes.wrong: 先生、これは分かるの？
grammarDetailPage.commonMistakes.correct: 先生、これは分かりますか？
grammarDetailPage.commonMistakes.why: の is casual, so it sounds too familiar toward a teacher or a superior; use ですか/ますか.
Key points
Used in casual speech with family, friends and children. Attach it to the plain form, and use なの after nouns and な-adjectives (not だの). It sounds softer and more personal than か, and it is not suitable for formal situations or for superiors; use ですか / んですか there.
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