スチロール樹脂 じゅしではありませんでした
suchirōrujushidewārimasendeshita

Noun
Desu Copula

The polite, past negative form of スチロール樹脂

1. Was not polystyrene resin.; Was not made of polystyrene resin.

Past/Perfective
Negative
Polite
Formal Register