rellenaría

conditional first-person form-of singular third-person

rellenarの一人称/三人称単数条件法

English Meaning

first/third-person singular conditional of rellenar

Si fuera el primero en inscribirse, rellenaría cuidadosamente cada sección del formulario.

もし私が最初に登録するなら、フォームの各セクションを丁寧に記入するだろう.

If I were the first to enroll, I would carefully fill out every section of the form.