成年 せいねん しゃ飲酒 いんしゅ禁止 きんし ほうであれば
miseinenshainshukin shi hōdeareba

Noun
Da Copula

The "-eba" conditional form ("if/when…") of 未成年者飲酒禁止法

1. If it were the underage drinking ban law; If the underage drinking ban law existed

Ba Conditional
Law