Unit 7 - Irregular Verbs in the Present Tense
Lesson 7.4 - Stem Changing Verbs: o => ue
Exercises 7.4 Quiz 7.4
Topic:

More stem changing verbs in the present tense. These forms change "o" to "ue".

If you managed the previous lesson, this one will be easy.

This is simply a different kind of stem-changing verb. This time, the final "o" in the verb stem changes to "ue".

For an example, let's use the verb almorzar Play Audio which means to have lunch.

Present Tense Conjugation of almorzar

Subject
Ending
Verb Form
Subject
Ending
Verb Form
Yo
-o
Play Audio
almuerzo
Nosotros
-amos
Play Audio
almorzamos
-as
Play Audio
almuerzas
Vosotros
-áis
Play Audio
almorzáis
Él/Ella
-a
Play Audio
almuerza
Ellos
-an
Play Audio
almuerzan

The stem changes again only apply to the four forms in "the boot" shape.

A usage example:
Normalmente, Isabela almuerza en un restaurante. Play Audio
Normally, Isabela eats lunch in a restaurant.

As a second example, let's revisit a verb that you already learned in this unit: poder, meaning to be able to or can.

Present Tense Conjugation of poder

Subject
Ending
Verb Form
Subject
Ending
Verb Form
Yo
-o
Play Audio
puedo
Nosotros
-emos
Play Audio
podemos
-es
Play Audio
puedes
Vosotros
-éis
Play Audio
podéis
Él/Ella
-e
Play Audio
puede
Ellos
-en
Play Audio
pueden

You learned to conjugate poder as an irregular verb, but we now see that it is one of this larger group, the o => ue stem-changing verbs.

For your reference, here's a rather long list of verbs that follow this pattern.

As before, I don't recommend trying to memorize the list, but instead to simply watch for this pattern as it occurs in the exercises and in your reading.

A list of many common o => ue stem-changers

acordar to agree (upon)
almorzar to lunch, to have lunch
aprobar to approve, to pass a test
colgar to hang (up)
comprobar to check, to verify
contar to count, to relate, to tell
costar to cost
demostrar to demonstrate, to prove
devolver to return (an object), to refund, to give back
doler to ache, to pain, to hurt, to cause grief, to cause regret
dormir to sleep
encontrar to meet, to encounter, to find
llover to rain
morir to die
mostrar to show, to point out, to display
mover to move, to persuade, to excite
poder to be able, can
probar to test, to prove, to try, to try on
recordar to remember, to recall, to remind
resolver to resolve, to solve (a problem)
soler to be accustomed to, to be in the habit of
soñar to dream
sonar to ring, to echo, to resound, to sound
volar to fly
volver to return, to go back

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Additional Study Resources

Videos:
The Language Tutor covers the "ue" stem changing verbs. (7:22)
Focus on o => ue stem changing verbs. Explanation, examples, and exercises. (6:12)
Websites:
If you want an explanation that looks individually at every conjugation of the o => ue verbs, this is the place.
Books:
Chapter 8, Stem-changing verbs, o > ue, 4th edition pg 65.
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