くまねずみじゃなかったです
熊鼠じゃなかったです
kumanezumijanakattadesu

Noun
Desu Copula

The polite, past negative form of くまねずみ

1. Was not a bear mouse.; Wasn't a bear mouse.

Past/Perfective
Negative
Polite
Casual Register
Usually Written in Kana