くまざさじゃありませんでした
熊笹じゃありませんでした
kumazasajārimasendeshita

Noun
Desu Copula

The polite, past negative form of くまざさ

1. Was not bear grass.; Was not a type of bamboo.

Past/Perfective
Negative
Polite
Terminal Form
Usually Written in Kana