Patterns in Verb Stem Changes
Pattern 2: o→ue
(-ar and -er verbs)
Model Verb: contar

  
  Present Indicative Present Subjunctive Imperatives  
  cuento cuente
---
  
  cuentas cuentes cuenta / no cuentes  
  cuenta cuente (no) cuente Ud.  
  contamos contemos (no) contemos  
  contáis contéis contad / no contéis  
  cuentan cuenten (no) cuenten Uds.  
  Other tenses and forms are unaffected.  
 

Other Common Verbs With This Pattern (*most common)

absolver, acordar*, acostar*, almorzar*, aprobar*, avergonzar, cocer, colgar, comprobar, contar*, conmover, costar*, demostrar*, desaprobar, descontar, devolver*, disolver, encontrar*, esforzar, forzar*, jugar* (u→ue), llover*, moler, morder, mostrar*, mover*, oler, poder*, probar*, promover, recordar*, renovar, resolver*, rodar, rogar, soler, soltar, sonar*, soñar*, torcer, tostar, tronar, volar*, volcar, volver*