二十 にじゅう いち だい しゅうじゃなかったです
nijū ichidaishūjanakattadesu

Noun
Desu Copula

The polite, past negative form of 二十一代集

1. Wasn't the 21st generation.; Wasn't part of the 21st generation.

Past/Perfective
Negative
Polite
Casual Register