しろ蝶貝 ちょうがいじゃありませんでした
shi rochōgaijārimasendeshita

Noun
Desu Copula

The polite, past negative form of 白蝶貝

1. It was not a white butterfly shell.; It wasn't a mother-of-pearl.

Past/Perfective
Negative
Polite
Terminal Form