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Learn about stem changes in the Preterite tense for -er and -ir verbs. The vowel before the infinitive ending affects the third-person conjugations. For example, "creer" becomes "creí" in the preterite tense.
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i>y stem changes in the Preterite There are some –er and –ir verbs in which a vowel immediately precedes the infinitive ending. In the third persons, the “i” in the ending changes to “y” Creer creícreímos creístecreísteis creyócreyeron