住民 じゅうみん基本 きほん台帳 だいちょうだったら
jūminkihondaichōdattara

Noun
Da Copula

The "-tara" conditional form ("if/when…") of 住民基本台帳

1. If/when [it's] the resident registration system; If [it were] the resident registration system

Tara Conditional