おういもじゃありませんでした
大薯じゃありませんでした
ō imojārimasendeshita

Noun
Desu Copula

The polite, past negative form of だいじょ

1. It wasn't a large french fry.; It wasn't a large potato.

Past/Perfective
Negative
Polite
Terminal Form
Usually Written in Kana