Preterite: Stem Changing Verbs
-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 | Preterite |
|---|---|
| entender | entender |
| entiendo | entendí |
| entiendes | entendiste |
| entiende | entendió |
| entendemos | entendimos |
| entendéis | entendisteis |
| entienden | Entendieron |
| Present | Preterite |
|---|---|
| cerrar | cerrar |
| cierro | cerré |
| cierras | cerraste |
| cierra | cerró |
| cerramos | cerramos |
| cerráis | cerrasteis |
| cierran | cerraron |
-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 | Preterite |
|---|---|
| preferir | preferir |
| prefiero | preferí |
| prefieres | preferiste |
| prefiere | prefirió |
| preferimos | preferimos |
| preferís | preferisteis |
| prefieren | prefirieron |
| Present | Preterite |
|---|---|
| dormir | dormir |
| duermo | dormí |
| duermes | dormiste |
| duerme | durmió |
| dormimos | dormimos |
| dormís | dormisteis |
| duermen | durmieron |
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