ますのすけじゃなかったです
鱒の介じゃなかったです
masuno sukejanakattadesu

Noun
Desu Copula

The polite, past negative form of ますのすけ

1. Was not Masunosuke.; Wasn't Masunosuke.

Past/Perfective
Negative
Polite
Casual Register
Usually Written in Kana