春秋 しゅんじゅう戦国 せんごく時代 じだいでしょう
shunjūsengokujidaideshō

Noun
Desu Copula

Expresses probability in a polite manner ("probably…") of 春秋戦国時代

1. Probably the Spring and Autumn and Warring States period.

Polite
Presumptive
Conjecture