授業 じゅぎょう参観 さんかん ではありませんでした
jugyōsankanhidewārimasendeshita

Noun
Desu Copula

The polite, past negative form of 授業参観日

1. Was not a school observation day.; It was not a school visit day.

Past/Perfective
Negative
Polite
Formal Register