選抜せんばつ高等こうとう学校がっこう野球やきゅう大会たいかいであれば
sembatsukōtōgakkōya kyūtaikaideareba

Noun
Da Copula

The "-eba" conditional form ("if/when…") of 選抜高等学校野球大会

1. If/when the Selected High School Baseball Tournament…; If the Selected High School Baseball Tournament were…

Ba Conditional