N4143/179

かい

Verb (plain) + かいい-adjective + かいな-adjective/Noun + かい

Meanings

  • informal question marker (masculine/slang)
  • rough way to ask a question
  • tag question used by men
  • soften/roughen a question depending on tone

About this pattern

Explanation

かい is a sentence-ending particle used in casual speech, primarily by men. It adds a rough, friendly, or brusque tone to a question. It’s common in everyday conversation and among friends or peers, but can sound old-fashioned or rude in formal settings. It’s often used with short, direct questions and tends to appear with the plain form of verbs or adjectives rather than polite speech.

Learn in context

Example sentences

これは本当かい。

Is this true?

明日行くかい。

Are you going to go tomorrow?

元気かい。

Are you feeling well?

どうしてそんなことをするのかい。

Why would you do something like that?

時間がないのかい。

Do you not have time?