だい日本 にっぽん帝国 ていこく海軍 かいぐんではありませんでした
dainipponteikokukaigundewārimasendeshita

Noun
Desu Copula

The polite, past negative form of 大日本帝国海軍

1. Was not a member of the Imperial Japanese Navy.; Was not part of the Imperial Japanese Navy.

Past/Perfective
Negative
Polite
Formal Register