春秋 しゅんじゅう戦国 せんごくじゃなかったです
shunjūsengokujanakattadesu

Noun
Desu Copula

The polite, past negative form of 春秋戦国

1. Was not the Spring and Autumn/Warring States period.

Past/Perfective
Negative
Polite
Casual Register