くさかげろうじゃなかったです
草蜉蝣じゃなかったです
kusakagerōjanakattadesu

Noun
Desu Copula

The polite, past negative form of くさかげろう

1. Was not a mayfly.; Wasn't a mayfly.

Past/Perfective
Negative
Polite
Casual Register
Usually Written in Kana