verbos radicales (e-->i, i-->í, u-->ú, y)

to fire, to let go

to say goodbye

to groan, to moan

to stop, to intrude

to measure

to ask for, to request

to laugh

to scold

to repeat

to follow, to keep on

to serve

to smile

to dress

to confide, to rely on

to send

to spy

to trust

to vary

to act

to graduate

to continue

to attribute

to conclude

to contribute

to destroy

to distribute

to flee, to run away

to include

to influence

to substitute