小中高生 しょうちゅうこうせいではありませんでした
shōchū kōseidewārimasendeshita

Noun
Desu Copula

The polite, past negative form of 小中高生

1. Was not a junior/senior/high school student.; Was not an elementary/middle/high school student.

Past/Perfective
Negative
Polite
Formal Register