陈词滥调的词干变化动词

 -ar and -er verbs that change their stem in the present tense do not change in the preterite. They are conjugated just like other regular preterite verbs, using the regular endings.

cerrar

cerré

cerraste

cerró

cerramos

cerrasteis

cerraron

entender

entendí

entendiste

entendió

entendimos

entendisteis

entendieron

-ir verbs that change their stem in the present tense do change in the preterite, but in a different way. They change e:i and o:u in the third person, singular and plural.

preferir

preferí

preferiste

prefirió

preferimos

preferisteis

prefirieron

dormir

dormí

dormiste

durmió

dormimos

dormisteis

durmieron