かげろうじゃなかったです
蜻蛉じゃなかったです
kagerōjanakattadesu

Noun
Desu Copula

The polite, past negative form of とんぼ

1. Wasn't a dragonfly.; Wasn't an insect of the dragonfly family.

Past/Perfective
Negative
Polite
Casual Register
Usually Written in Kana