南北朝 なんぼくちょうではありませんでした
nambo kuchōdewārimasendeshita

Noun
Desu Copula

The polite, past negative form of 南北朝

1. Was not the Northern and Southern Dynasties period.; Was not a period of Northern and Southern Dynasties.

Past/Perfective
Negative
Polite
Formal Register