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Preterite: Part III

-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.

Present entender entiendo entiendes entiende entendemos entendéis entienden	Preterite entender entendí entendiste entendió entendimos entendisteis entendieron
Present cerrar cierro cierras cierra cerramos cerráis cierran	Preterite cerrar cerré cerraste cerró cerramos cerrasteis cerraron

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-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.

Present preferir prefiero prefieres prefiere preferimos preferís prefieren	Preterite preferir preferí preferiste prefirió preferimos preferisteis prefirieron
Present dormir duermo duermes duerme dormimos dormís duermen	Preterite dormir dormí dormiste durmió dormimos dormisteis durmieron

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Let's add two more flashcards for stem-changing verbs in the preterite.:

Verb Flashcards

50. -ar and -er stem-changing verbs do not change in the preterite

cerrar	entender
cerré	entendí
cerraste	entendiste
cerró	entendió
cerramos	entendimos
cerrasteis	entendisteis
cerraron	entendieron

51. -ir stem-changing verbs do change in the preterite (e:i and o:u third person singular and plural)

preferir	dormir
preferí	dormí
preferiste	dormiste
prefirió	durmió
preferimos	dormimos
preferisteis	dormisteis
prefirieron	durmieron

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