stem-changers

to lose

perder (ie)

to want

querer (ie)

to prefer

preferir (ie)

to think/plan

pensar (ie)

to lie

mentir (ie)

to close

cerrar (ie)

to begin/start

empezar/comenzar (ie)

to understand

entender (ie)

to be able to (can)

poder (ue)

to tell/count

contar (ue)

to cost

costar (ue)

to find/meet

encontrar (ue)

to remember

recordar (ue)

to fly

volar (ue)

to sleep

dormir (ue)

to return

volver (ue)

to return an item (give back)

devolver (ue)

to have lunch

almorzar (ue)

to play

jugar (ue)

to ask for/order

pedir (i)

to serve

servir (i)

to repeat

repetir (i)

to follow/continue

seguir (i)