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

Noun
Desu Copula

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

1. Wasn't (a ru-verb); Wasn't (of the ka-group)

Past/Perfective
Negative
Polite
Casual Register
Linguistics