まるすげでわありませんでした
丸菅ではありませんでした
marusugedewārimasendeshita

Noun
Desu Copula

The polite, past negative form of まるすげ

1. It was not a round tube.; It wasn't a round pipe.

Past/Perfective
Negative
Polite
Formal Register
Usually Written in Kana