っけ (kke)
～っけ — was it ～? (recalling)
Pattern
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普通形（名詞・Aな＋だ）＋っけPlain form (+ だ) + っけ
Meaning
何時からだっけ and 何だっけ show you should know the answer but have forgotten and are trying to recall it. It can be a murmur or a question to someone. ～たっけ asks about a past memory.
When to use
Casual talk with friends and family. With superiors switch to a polite form like ～でしたか. ～だったっけ is for checking a past fact.
Examples
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明日（あした）の会議（かいぎ）は何時（なんじ）からだっけ。
Ashita no kaigi wa nanji kara dakke.
What time was tomorrow's meeting again?
-
あれ、この漢字（かんじ）の読（よ）み方（かた）は何（なん）だっけ。
Are, kono kanji no yomikata wa nan dakke.
Huh, what was the reading of this kanji again?
-
君（きみ）の誕生日（たんじょうび）は来週（らいしゅう）だったっけ。
Kimi no tanjōbi wa raishū datta kke.
Your birthday was next week, right?
Common mistakes
- It can refer to future plans, but only when you have forgotten or are unsure. It is not for things you are learning for the first time.
- It is casual, so avoid it with superiors and in writing.
More grammar points
- ばよかった ～ばよかった — I should have ～, if only I had ～
- ばかりで ～ばかりで — only ～ (and nothing else, with a negative feeling)
- ばかりでなく ～ばかりでなく — not only ～ but also ～
- だけでなく ～だけでなく — not only ～ but also ～
- だけど だけど — but, however (casual)
- ふりをする ～ふりをする — pretending to ～
- 一方（いっぽう）だ ～一方だ — keeps ～ing in one direction
- 一体（いったい） 一体 — what on earth ～ (emphasizing a question)
- じゃない ～じゃない — isn't it ～! (surprise or confirmation)
- か何（なに）か ～か何か — ～ or something
- 代（か）わりに ～代わりに — instead of ～, in return for ～
- 結局（けっきょく） 結局 — in the end, after all
- きり ～きり — only ～; ever since ～
- ことになっている ～ことになっている — it is the rule or plan that ～
- ことは～が ～ことは～が — it is true that ～, but ～
- くせに ～くせに — even though ～ (with reproach)
- も～ば～も A も ～ば B も ～ — both A and B
- むしろ むしろ — rather, if anything
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