くまねずみじゃありませんでした
熊鼠じゃありませんでした
kumanezumijārimasendeshita

Noun
Desu Copula

The polite, past negative form of くまねずみ

1. Was not a bear mouse.; Was not a tanuki.

Past/Perfective
Negative
Polite
Terminal Form
Usually Written in Kana