Multiple choice general knowledge foreign languages Wie alt ..... du ? bist ist bin wir Reveal answer Fill a bubble to check yourself A Correct answer Explanation In German, 'Wie alt bist du?' means 'How old are you?' The verb 'sein' (to be) conjugates as 'bist' for 'du' (informal you). 'Ist' is for 'er/sie/es', 'bin' is for 'ich', and 'wir' means 'we'.