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‐ar or ‐er Verbs in the Preterit

No - ar or - er verbs undergo a stem change in the preterit. Remember that - ar and - er verbs that undergo a stem change in the present tense do not undergo a stem change in the preterit. The verb pensar (to think) is a good example of this. Look carefully at the forms in Table 1 and notice the lack of stem change in the preterit.

TABLE 1 Preterit Forms of the Verb Pensar (to Think)

Subject

Verb

Subject

Verb

yo

pensé

nosotros/nosotras

pensamos

pensaste

vosotros/vosotras

pensasteis

él

pensó

ellos

pensaron

ella

pensó

ellas

pensaron

usted

pensó

ustedes

pensaron

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