Spanish preterite Stem-Changing Verbs

The first conjugation (-ar) and the second conjugation (-er) stem-changing verbs do not have stem changes in the preterit tense. On the other hand, the third conjugation stem-changing verbs do have stem changes that occur in the third person singular and plural.

There are two patterns: o — u, and e — i.

I will illustrate these patterns below. I will indicate where the stem changes with underlined italic type. The endings for m-changing verbs are regular.

When you look up these verbs in a dictionary, you will find in parentheses the following standard notations.

dormir (ue, u) / to sleep

mentir (ie, i) / to lie

servir (i, i) / to serve

Remember that the first vowel(s) mean(s) that there is a stem change in present tense in the form of a shoe The second vowel means that there is also a stem change in the preterit tense in the third person singular and plural, as well as the present participle . We will see examples of all three of these verbs.

 

Therefore let’s look have do this verbs change in the third conjugation

First pattern

Please click here for the third conjugation pattern dormir (ue, u) / to sleep

Second pattern

Please click here for the third conjuagtion pattern mentir (e, i) / to lie

Third Pattern

Please click here for the third conjugation pattern servir (i, i) / to serve