さかさなまずじゃありませんでした
逆さ鯰じゃありませんでした
sakasanamazujārimasendeshita

Noun
Desu Copula

The polite, past negative form of さかさなまず

1. Was not an upside-down catfish.; Was not a reverse catfish.

Past/Perfective
Negative
Polite
Terminal Form
Usually Written in Kana