白腹 しろはら盗賊 とうぞく かもめじゃなかったです
shirohara tōzokukamomejanakattadesu

Noun
Desu Copula

The polite, past negative form of 白腹盗賊鴎

1. Was not a white-bellied thief gull.

Past/Perfective
Negative
Polite
Casual Register