むかしとんぼじゃありませんでした
昔蜻蛉じゃありませんでした
mukashitombojārimasendeshita

Noun
Desu Copula

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

1. Was not a dragonfly.; Was not a darner.

Past/Perfective
Negative
Polite
Terminal Form
Usually Written in Kana