笑気 しょうき麻酔 ますいではありませんでした
shōkimasuidewārimasendeshita

Noun
Desu Copula

The polite, past negative form of 笑気麻酔

1. Was not nitrous oxide anesthesia.; Was not laughing gas anesthesia.

Past/Perfective
Negative
Polite
Formal Register