たいはくびそじゃなかったです
大白檜曽じゃなかったです
taiwa kubisojanakattadesu

Noun
Desu Copula

The polite, past negative form of おおしらびそ

1. Wasn't Ōshiro.; Wasn't a white cypress.

Past/Perfective
Negative
Polite
Casual Register
Usually Written in Kana