学生

How it works

This is a casual question built from the noun 学生(がくせい) (student) plus the ending なの (is it that…?). The な (linking na) is the form the plain copula だ (is) takes before の (explanatory), and that の (explanatory) adds a soft "so it's that…" feeling — you're confirming something you suspect. The rising ？ (?) finishes it as a gentle "are you a student, then?"