溶岩 ようがん洞穴 どうけつではありませんでした
yōgandōketsudewārimasendeshita

Noun
Desu Copula

The polite, past negative form of 溶岩洞穴

1. Was not a lava cave.; It was not a lava cave.

Past/Perfective
Negative
Polite
Formal Register