To this point, the irregular verbs presented have the irregularity in the endings of the conjugated verb form. However, there is a different kind of predictable verb conjugation where the stem of the verb changes. These verbs have all the regular endings (even the yo form!) but have a change occur in the stem of the verb in certain forms. The stem of the verb is what remains when you remove the – ar, - er, or – ir ending from the infinitive form of the verb. Because it is the stem of the verb that changes, these verbs are called stem-changing verbs or stem-changers. It is impossible to identify that a verb is a stem-changer simply by looking at the infinitive unless you have previously learned this particular verb and remember that it is a stem-changer. Stem-changing verbs could be – ar, –er, or – ir verbs. You can, at least, count on the stressed
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