つしまてんじゃなかったです
対馬貂じゃなかったです
tsushimatenjanakattadesu

Noun
Desu Copula

The polite, past negative form of つしまてん

1. Wasn't a tanuki.; Wasn't a marten.

Past/Perfective
Negative
Polite
Casual Register
Usually Written in Kana