"Stem Changers", "o changes to ue e changes to ie e changes to i All of these make the boot" "o changes to ue", "In this group all conjugations except nosotros and vosotros change the o in stem to ue: volar: vuelo ... mover: muevo ... dormir: duermo ... contar, costar, encontrar, recordar, volar devolver, envolver, morder, mover, volver dormir, morir" "e changes to ie", "In this group the e in stem changes to ie for all conjugations except nosotros and vosotros: empezar: empiezo, ... entender: entiendo, ... mentir: miento, ... cerrar, comenzar, empezar, fregar, negar, pensar defender, entender, perder, querer advertir, consentir, hervir, mentir, preferir, sentir" "e changes to i", "This group changes e in the stem to i, and it applies only to *IR verbs. pedir: pido, pides, pide, pedimos, -, piden competir, decir, elegir, gemir, pedir, reír, repetir, servir"
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