炭塵 たんじん爆発 ばくはつじゃありませんでした
tanjimbakuhatsujārimasendeshita

Noun
Desu Copula

The polite, past negative form of 炭塵爆発

1. Was not a coal dust explosion.; It was not a coal dust explosion.

Past/Perfective
Negative
Polite
Terminal Form