The verbs Conocer, Hacer, Oír

These 3 verbs have irregularities. Conocer (to know a person/place) and Hacer (to do/make) both have irregular "yo" forms, other than that, they are totally regular, so the endings will match those of -er verbs. Oír (to hear) not only has an irregular "yo" form, but it also has some irregular forms. Now it adds a "y" in the verb, and in a sense it's a stem-changing verb since the stem goes from o- to oy-.

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