にっぽんまむしじゃなかったです
日本蝮じゃなかったです
nippommamushijanakattadesu

Noun
Desu Copula

The polite, past negative form of にほんまむし

1. Was not a Japanese mamushi.; Wasn't a Japanese viper.

Past/Perfective
Negative
Polite
Casual Register
Usually Written in Kana