Which one should you use?
While か is a standard question marker, different forms change the tone and intent. かな is an informal variant used to express curiosity, doubt or a personal opinion. The casual variant っけ is used to ask questions or to confirm information. For a more polite approach, でしょうか shows respect and humility toward the listener.
Is there a formal and an informal way to say it?
The use of か at the end of a plain form sentence is common in casual speech, but it can sound blunt or even aggressive if used with someone of higher status. For polite speech, か is typically preceded by the copula ですか (desu ka). For a more formal and respectful tone, use でしょうか.
How does it change in a sentence?
When used with a dictionary form or a plain form verb, か turns the statement into a question. In polite contexts, the particle is usually preceded by です to form ですか.
How do you pronounce it?
ka
Did you know?
- While the word か sounds identical to the question marker -kah in Malay and Indonesian, they are false cognates and have no historical relationship.
- In spoken Japanese, speakers often omit か entirely and simply use a rising intonation to indicate a question.
- Depending on the tone, か can be used as a one-word response meaning 'Is that so?' or 'I see', rather than as a question marker.
Examples in context
- 「おバカチックな質問していい？これなんて読むの？コロナ……？うず？なべ？違うよね」「コロナか」「あっ、『か』なんだ」「もっとテレビも見た方がいいと思うよ」"Is it ok if I ask a stupid question? Can you read this? Korona… uzu? nabe? or something else?" "Koronaka." "Ah, ka." "I think you should be watching more TV."This example shows how か is used to respond to a realization or a question.Tatoeba #9034884 by small_snow, translation #9988032 by tsp_2
- 昼ごはんを食べに行きませんか？Would you like to go for lunch?
Example conversation
Yui and Ren are at a cafe.
- 結衣 Yui蓮さんはコーヒーを飲みますか？Ren-san wa koohii o nomimasu ka?Will you drink coffee, Ren?
- 蓮 Renはい、飲みます。Hai, nomimasu.Yes, I will.
- 結衣 Yui砂糖はいりますか？Satou wa irimasu ka?Do you need sugar?
- 蓮 Renいいえ、結構です。Iie, kekkou desu.No, I'm fine.
Sources
- Pronunciation: Wiktionary entry か, CC BY-SA 4.0, dump of 2026-09-26.
- Word origins: Wiktionary entries か, CC BY-SA 4.0.
- Example sentences: Tatoeba CC BY 2.0 FR.
