まはぜじゃありませんでした
真鯊じゃありませんでした
mahazejārimasendeshita

Noun
Desu Copula

The polite, past negative form of まはぜ

1. It was not a true shark.; It wasn't a real shark.

Past/Perfective
Negative
Polite
Terminal Form
Usually Written in Kana