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

Noun
Desu Copula

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

1. Wasn't (of the na-group verbs)

Past/Perfective
Negative
Polite
Casual Register
Linguistics