じゅう ぷん きに運転 うんてんじゃありませんでした
jūpun'okini untenjārimasendeshita

Noun
Desu Copula

The polite, past negative form of 十分置きに運転

1. Was not driven every ten minutes.; Was not operated every ten minutes.

Past/Perfective
Negative
Polite
Terminal Form