You add this to the end of a question. It shows you are a little surprised or curious. Men often use it when talking to younger people.
Verb [dictionary form] + のかい？Primary
い-Adjective + のかい？
な-Adjective + な + のかい？
Noun + な + のかい？
You add this to the end of a question. It shows you are a little surprised or curious. Men often use it when talking to younger people.
もう帰るのかい？まだパーティーは始まったばかりだよ。
You're going home already? The party has only just begun.
昨日、本当に一人でその山に登ったのかい？大したもんだな。
Did you really climb that mountain by yourself yesterday? That's quite something.
なんだ、まだ宿題が終わっていないのかい？手伝ってやろうか？
What, you still haven't finished your homework? Shall I help you?
「そんなに面白いのかい」と、祖父は私の読んでいる本を覗き込んだ。
Is it that interesting?' my grandfather said, peering at the book I was reading.
ほう、君が新しい部長なのかい？ずいぶん若いんだな。
Oh, so you're the new department head? You're quite young.
This sounds like an older man speaking. He might be talking to someone younger. Younger people can use it to be funny or sound old-fashioned.
This is different from other similar ways to ask questions. "~no ka?" is very direct. It can sound like a challenge. "~no?" is softer. Anyone can use it. It is very common in casual talk. "~no kai?" is in the middle. It shows real interest. It has a gentle feeling. The other forms do not have this gentle feeling.
Don't use this when you talk to your boss. It is too casual. You can use it when you talk to friends. You can use it when you talk to family. It is for speaking, not writing. It sounds rude in formal places. It sounds strange with strangers.
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