消灯 しょうとうラッパではありませんでした
shōtōrappadewārimasendeshita

Noun
Desu Copula

The polite, past negative form of 消灯ラッパ

1. Was not the lights-out bugle.; Was not the signal to turn off the lights.

Past/Perfective
Negative
Polite
Formal Register