単葉 たんよう飛行 ひこう ではありませんでした
tan'yō hikōkidewārimasendeshita

Noun
Desu Copula

The polite, past negative form of 単葉飛行機

1. Was not a single-engine aircraft.; Was not a light aircraft.

Past/Perfective
Negative
Polite
Formal Register