おうかでわありませんでした
大蚊ではありませんでした
ōkadewārimasendeshita

Noun
Desu Copula

The polite, past negative form of ががんぼ

1. Was not a large mosquito.; Was not a big mosquito.

Past/Perfective
Negative
Polite
Formal Register
Usually Written in Kana