やんちゃ坊主 ぼうずではありませんでした
yancha bōzudewārimasendeshita

Noun
Desu Copula

The polite, past negative form of やんちゃ坊主

1. Was not a mischievous boy.; Was not a rambunctious child.

Past/Perfective
Negative
Polite
Formal Register