皇太子 こうたいし殿下 でんかじゃありませんでした
kōtaishidenkajārimasendeshita

Noun
Desu Copula

The polite, past negative form of 皇太子殿下

1. Was not the Crown Prince.; Was not His Imperial Highness the Crown Prince.

Past/Perfective
Negative
Polite
Terminal Form