すっぽんきのこじゃないです
鼈茸じゃないです
supponkinokojanaidesu

Noun
Desu Copula
Negation Auxiliary

The polite negative form of すっぽんたけ

1. It's not *suppon* (turtle).; It's not *suppon-dake* (just turtle).

Negative
Polite
Casual Register
Usually Written in Kana