けながねずみでわありませんでした
毛長鼠ではありませんでした
kenaganezumidewārimasendeshita

Noun
Desu Copula

The polite, past negative form of けながねずみ

1. Was not a long-haired mouse.; Was not a mouse with long hair.

Past/Perfective
Negative
Polite
Formal Register
Usually Written in Kana