びわこおうなまずじゃありませんでした
琵琶湖大鯰じゃありませんでした
biwako ō namazujārimasendeshita

Noun
Desu Copula

The polite, past negative form of びわこおおなまず

1. Was not a large catfish of Lake Biwa.; Was not the great catfish of Lake Biwa.

Past/Perfective
Negative
Polite
Terminal Form
Usually Written in Kana