だいとうみんねずみじゃありませんでした
大冬眠鼠じゃありませんでした
daitōminnezumijārimasendeshita

Noun
Desu Copula

The polite, past negative form of おおやまね

1. Was not a hibernating mouse.; Was not a large hibernating mouse.

Past/Perfective
Negative
Polite
Terminal Form
Usually Written in Kana