地球 ちきゅう がい生物 せいぶつじゃなかったです
chikyūga i seibutsujanakattadesu

Noun
Desu Copula

The polite, past negative form of 地球外生物

1. Wasn't extraterrestrial life.; Wasn't alien life.

Past/Perfective
Negative
Polite
Casual Register