南北朝 なんぼくちょう時代 じだいではありません
nambo kuchōjidaidewārimasen

Noun
Desu Copula
Negation Auxiliary

The polite negative form of 南北朝時代

1. It is not the Nanboku-chō period.; It isn't the Nanboku-chō period.

Negative
Polite
Formal Register