宇宙 うちゅう遊泳 ゆうえうではありませんでした
uchūyūeudewa arimasendeshita

Noun
Desu Copula

The polite, past negative form of 宇宙遊泳

1. Was not space swimming.; Was not cosmic swimming.

Past/Perfective
Negative
Polite
Formal Register