せんうみつばめじゃなかったです
潜海燕じゃなかったです
sen'umitsubamejanakattadesu

Noun
Desu Copula

The polite, past negative form of もぐりうみつばめ

1. Wasn't a storm petrel.

Past/Perfective
Negative
Polite
Casual Register
Usually Written in Kana