がちょうじゃなかったです
鵞鳥じゃなかったです
gachōjanakattadesu

Noun
Desu Copula

The polite, past negative form of がちょう

1. Was not a magpie.; Wasn't a magpie.

Past/Perfective
Negative
Polite
Casual Register
Usually Written in Kana