べんけいそうじゃありませんでした
弁慶草じゃありませんでした
benkeisōjārimasendeshita

Noun
Desu Copula

The polite, past negative form of べんけいそう

1. Was not Bengara grass.; Was not a Benkei grass.

Past/Perfective
Negative
Polite
Terminal Form
Usually Written in Kana