どうくつくまじゃなかったです
洞窟熊じゃなかったです
dōkutsukumajanakattadesu

Noun
Desu Copula

The polite, past negative form of ほらあなぐま

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

Past/Perfective
Negative
Polite
Casual Register
Usually Written in Kana