だい航海 こうかい時代 じだいじゃなかったです
daikōkai jidaijanakattadesu

Noun
Desu Copula

The polite, past negative form of 大航海時代

1. Wasn't the Age of Great Navigation.; Wasn't a time of great voyages.

Past/Perfective
Negative
Polite
Casual Register