ぬまもつでわありませんでした
沼鯥ではありませんでした
numa motsudewārimasendeshita

Noun
Desu Copula

The polite, past negative form of ぬまむつ

1. Was not a swamp trout.; Was not a marsh carp.

Past/Perfective
Negative
Polite
Formal Register
Usually Written in Kana