Spanish Stem Changing Verbs

In Spanish, there are three types of verbs: -ar, -er, and -ir. When a Spanish verb ends in -ar, -er, or -ir, it is in its infinitive form. The infinitive is composed of two parts: the stem and the ending. Review the following examples of infinitve verbs. The stem of each infinitive verb is underlined. The ending is in bold.

  • hablar
  • comer
  • venir
With regular Spanish verbs, the stem never changes. Only the ending changes when the verb is conjugated. However, with some verbs, both the stem and ending change when the verb is conjugated. These are known as stem-changing verbs. With stem-changing verbs, the stem-change only occurs in 1st, 2nd, 3rd person singular and 3rd person plural. There are six types of stem-changes, as follows: