物質 ぶっしつ交代 こうたいじゃありませんでした
busshitsukōtaijārimasendeshita

Noun
Desu Copula

The polite, past negative form of 物質交代

1. It wasn't a material change.; It wasn't a substitution of materials.

Past/Perfective
Negative
Polite
Terminal Form