京浜 けいひん急行 きゅうこう空港 くうこう せんであれば
keihinkyūkō kū kōsendeareba

Noun
Da Copula

The "-eba" conditional form ("if/when…") of 京浜急行空港線

1. If it were the Keikyu Airport Line; If the Keikyu Airport Line existed

Ba Conditional
Business