おうかじゃありませんでした
大蚊じゃありませんでした
ōkajārimasendeshita

Noun
Desu Copula

The polite, past negative form of ががんぼ

1. It was not a large mosquito.; It wasn't a big mosquito.

Past/Perfective
Negative
Polite
Terminal Form
Usually Written in Kana