Spanish grammar: verbos con cambio vocálico en presente de indicativo

What this grammar point covers

In Spanish, some verbs change a vowel in their stem when conjugated in the present tense. These are called stem-changing verbs.

When to use it

You use these forms when talking about actions happening now (present tense) with certain verbs. The vowel change happens in all forms except nosotros and vosotros.

Key forms

• e → ie (pensar → pienso)
• o → ue (dormir → duermo)
• e → i (pedir → pido)

Examples

Tips

• Remember: The stem vowel changes in all forms except nosotros and vosotros.
• Not all verbs change their vowels; memorize the most common ones.
• Check the verb list to know which verbs are stem-changing.

Exceptions and edge cases

• The change does not happen in nosotros and vosotros forms.
• Some verbs have additional irregularities (like 'jugar' changes u → ue).