かげろうじゃありませんでした
蜉蝣じゃありませんでした
kagerōjārimasendeshita

Noun
Desu Copula

The polite, past negative form of かげろう

1. Was not a mayfly.; Was not a transient thing.

Past/Perfective
Negative
Polite
Terminal Form
Usually Written in Kana