酸素 さんそ吸入 きゅうにゅうではありませんでした
sansokyūnyūdewārimasendeshita

Noun
Desu Copula

The polite, past negative form of 酸素吸入

1. Was not oxygen inhalation.; Was not an oxygen treatment.

Past/Perfective
Negative
Polite
Formal Register