らぎょう変格 へんかく活用 かつようじゃなかったです
ragyōhenkakukatsuyōjanakattadesu

Noun
Desu Copula

The polite, past negative form of ラ行変格活用

1. Wasn't (a ru-verb); Wasn't (irregular ru-verb)

Past/Perfective
Negative
Polite
Casual Register
Linguistics