朝貢 ちょうこう貿易 ぼうえきじゃなかったです
chōkōbōekijanakattadesu

Noun
Desu Copula

The polite, past negative form of 朝貢貿易

1. Was not tributary trade.; Was not a trade of tribute.

Past/Perfective
Negative
Polite
Casual Register