確認 かくにん生物 せいぶつではありませんでした
mikakunin seibutsudewārimasendeshita

Noun
Desu Copula

The polite, past negative form of 未確認生物

1. Was not an unidentified creature.; Was not an unconfirmed lifeform.

Past/Perfective
Negative
Polite
Formal Register