むかしとんぼじゃないです
昔蜻蛉じゃないです
mukashitombojanaidesu

Noun
Desu Copula
Negation Auxiliary

The polite negative form of むかしとんぼ

1. It's not a dragonfly.; It wasn't a dragonfly.

Negative
Polite
Casual Register
Usually Written in Kana