Group 1: pensar

La e changes to ie in all the singular persons and in the third person of the plural of the present indicative and in the whole present subjunctive.

  • E AR acertar, acrecentar, alentar, apretar, arrendar, asentar, asosegar, aterrar, atravesar, calentar, cegar, cerrar, comenzar, concertar, confesar, denegar, desalentar, desasosegar, desconcertar, desenterrar, deshelar, desmembrar, despertar, desplegar, desterrar, emparentar, empezar, encerrar, encomendar, enmendar, ensangrentar, enterrar, errar, escarmentar, fregar, gobernar, helar, herrar, invernar, manifestar, mentar, merendar, negar, nevar, pensar, plegar, quebrar, recalentar, recomendar, refregar, regar, remendar, renegar, repensarse, replegar, restregar, reventar, salpimentar, segar, sembrar, sentar, serrar, sosegar, soterrar, subarrendar, temblar, tentar, tropezar.
  • E ER ascender, atender, defender, desatender, descender, encender, entender, extender, heder, perder, sobrentender, tender, trascender, verter.
  • E IR cernir, concernir * , discernir.
Present indicative Present subjunctive Imperative
Yo pienso Yo piense  
Tú piensas Tú pienses Tú piensa
Él piensa Él piense Usted piense
Nosotros pensamos Nosotros pensemos Nosotros pensemos
Vosotros pensáis Vosotros penséis Vosotros pensad
Ellos piensan Ellos piensen Ustedes piensen

* Concernir is defective. It is used in third persons of the present indicative, the present subjunctive, the imperfect indicative and the imperfect subjunctive, in the past and present participles, and in gerund.