すがいじゃなかったです
酢貝じゃなかったです
sugaijanakattadesu

Noun
Desu Copula

The polite, past negative form of すがい

1. Wasn't pickled ark shell.; Wasn't a vinegar-marinated shellfish.

Past/Perfective
Negative
Polite
Casual Register
Usually Written in Kana