Since I’m done studying for the JLPT (or more appropriately done failing the JLPT) I thought I’d post another grammar point. This is one you hear all the time in a variety of situations when someone has forgotten something and is trying to remember or get the person they’re talking to to remember.
Noun/Verb/Adjective (Plain Form/Polite Past Form) +っけ 何だっけ。 What is it again…
新宿だったっけ。 Was it Shinjuku? I can’t remember.
病気でしたっけ。 He was sick, right? I forgot.
買ったっけ・買いましたっけ。 Did he buy it? I forgot.
行くんだっけ。 He’s going, right? I forgot.
行ったんだっけ。 He went, didn’t he? I forgot.
行くんだったっけ・行くんでしたっけ。 He was going, wasn’t he?
冷たかったっけ。 It was cold, right?
注意:イ Adjectives don’t ever use the Past Polite form (~かったです) with っけ since it can’t attach to です. Also, it’s not recommended to use the Present Tense for Verbs or イ Adjectives. It’s generally unnatural (even in English) to forget something that didn’t happen yet.
This form is only used to express something you did know, but forgot. If you remember た・だ + っけ, you’ll be ok.