词干变化动词 O:UE

 The main form of the verb is called the infinitive. The infinitive consists of two parts: the ending and the stem. The ending is the last two letters. There are only three different endings: -ar, -er, and -ir. The stem is everything else, except the ending.

hablar: ending = ar, stem = habl

comer: ending = er, stem = com

vivir: ending = ir, stem = viv

Some spanish verbs are called stem-changers because when they are conjugated, the stem changes in a predictable way. In one group of stem-changing verbs, the letter o in the stem changes to ue in all but the nosotros and vosotros forms. This particular type of stem-changing verb is found in all three verb types.

contar

yo cuento

tú cuentas

él, ella, Ud. cuenta

nosotros/as contamos

vosotros/as contáis

ellos, ellas, Uds. cuentan

For a more complete discussion of verbs that change o:ue click here.

Here are some common o:ue stem-changing verbs.

acordar

to agree, decide

acostar

to put to bed

almorzar

to eat lunch

aprobar

to approve

colgar

to hang

contar

to count, to tell

costar

to cost

demostrar

to demonstrate, prove

devolver

to return an object

dormir

to sleep

encontrar

to find

envolver

to wrap

forzar

to force

morder

to bite

morir

to die

mostrar

to show

mover

to move an object, to motivate

poder

to be able to

probar

to test, taste

recordar

to remember

resolver

to solve

rogar

to beg, pray

soler

to be in the habit of

sonar

to sound, ring

so?ar

to dream

tostar

to toast

volar

to fly

volver

to return