_:n91415ea246ec4474b32addd7d196466dxb0
<http://schema.org/description>
"All rights reserved As you learned in Lección 6, -ar and -er stem- changing verbs have no stem change in the preterite. -Ir stem-changing verbs, however, do have a stem change. Study the following chart and observe where the stem changes occur.."
<https://slideplayer.es/slide/302545/>