だいとうみんねずみじゃなかったです
大冬眠鼠じゃなかったです
daitōminnezumijanakattadesu

Noun
Desu Copula

The polite, past negative form of おおやまね

1. Wasn't a hibernating mouse.

Past/Perfective
Negative
Polite
Casual Register
Usually Written in Kana