むかしとんぼじゃなかったです
昔蜻蛉じゃなかったです
mukashitombojanakattadesu

Noun
Desu Copula

The polite, past negative form of むかしとんぼ

1. Wasn't a dragonfly.; Wasn't a mayfly.

Past/Perfective
Negative
Polite
Casual Register
Usually Written in Kana