みずわらびじゃなかったです
水蕨じゃなかったです
mizuwarabijanakattadesu

Noun
Desu Copula

The polite, past negative form of みずわらび

1. Was not a water fern.; Wasn't a water fern.

Past/Perfective
Negative
Polite
Casual Register
Usually Written in Kana