こうらいうぐいすじゃなかったです
高麗鶯じゃなかったです
kōrai uguisujanakattadesu

Noun
Desu Copula

The polite, past negative form of こうらいうぐいす

1. Was not a Korean nightingale.; Wasn't a Korean bush warbler.

Past/Perfective
Negative
Polite
Casual Register
Usually Written in Kana