You've seen a stem-changer before...

Jugar is a U→UE Stem Changer

Look how in each form (EXCEPT NOSOTROS OR VOSOTROS) the "u" in JUGAR changes to "ue" after conjugating...

O→UE Stem Changers

• Verbs like PODER (to be able to) or DORMIR (to sleep) are irregular in a similar way.

• The "o" in their stem will change to "ue" upon conjugating in the present tense.

• This is the case for all forms again, EXCEPT NOSOTROS or VOSOTROS

THE VERB PODER

To be able to, to can

THE VERB DORMIR

To sleep

Other Verbs That Are O→UE Stem Changers...

• To count = contar

• To move = mover

• To eat lunch = almorzar

• To die = morir

• To show = mostrar

• To hang = colgar

• To cost = costar

Vamos a practicar...

Let's look at PODER and DORMIR specifically

Those are just a few out many, many others...