っけ

The sentence-ending particle っけ is used when trying to recall something or seeking confirmation about something you once knew but have forgotten. It conveys the nuance of "what was it again?", "was it…?", or "did I/you…?". It is casual and primarily used in spoken Japanese.

Basic usage – trying to remember

っけ is most commonly attached to the past tense of verbs, adjectives, or the copula to ask about something you're uncertain about or have forgotten.

Structure

っけ attaches to predicates in the following ways:

• Verb[た] + っけ: いった行ったっけ（Did I go…?）
• Noun / な-adj + だっけ: やすみ休みだっけ（Was it a holiday…?）
• Noun / な-adj + だったっけ: やすみ休みだったっけ（Was it a holiday…?）
• い-adj + かったっけ: たかかった高かったっけ（Was it expensive…?）
• Verb[plain] + んだっけ: あす明日くる来るんだっけ（Is it that you're coming tomorrow?）

Both だっけ and だったっけ are used with nouns and な-adjectives. だったっけ explicitly references a past event, while だっけ can feel slightly more immediate, but they are often interchangeable.

Talking to yourself vs. asking others

っけ can be used both as a self-directed question (muttering to oneself while trying to remember) and as a question directed at someone else (asking them to remind you).

Important nuance

っけ implies that the speaker once knew the information but has forgotten or is unsure. It is not used for asking about something entirely new. Compare:

• かれ彼のなまえ名前はなん何だっけきごう？ – What was his name again? (I knew it but forgot)
• かれ彼のなまえ名前はなん何ですかきごう？ – What is his name? (I never knew)

Because of its casual tone, っけ is generally not used in formal or polite settings.