修好 しゅうこう通商 つうしょう航海 こうかい条約 じょうやくであれば
shūkōtsūshōkōkaijōyakudeareba

Noun
Da Copula

The "-eba" conditional form ("if/when…") of 修好通商航海条約

1. If it were a treaty of friendship, commerce, and navigation; If the treaty were one of friendship, commerce, and navigation.

Ba Conditional