Popularity (by total correct streak): 10
Popularity (by number of users): 1

Cards

Yo (ser) soy  
Tú (ser) eres  
Ella/Él/Usted (ser) es  
Nosotros (ser) somos  
Vosotros (ser) sois  
Ellos/Ustedes (ser) son  

Quisition is a browser-based flashcard system that repeats old cards and introduces new ones at optimal time intervals. You can create your own card packs or use those developed by others.