かものはしじゃなかったです
鴨の嘴じゃなかったです
kamonohashijanakattadesu

Noun
Desu Copula

The polite, past negative form of かものはし

1. Wasn't a duck's bill.; Wasn't like a duck's bill.

Past/Perfective
Negative
Polite
Casual Register
Usually Written in Kana