Some Spanish verbs have a regular conjugation but their past participle (or one version of them) is irregular. Sometimes a verb has a regular past participle for conjugation and an irregular one used as an adjective (or noun).
[Often an irregular past participle belongs to an irregular verb. You will find these instances in their special conjugation tables (irregular verbs ending in -ar | ending in -er | ending in -ir).]
Verbs with only an irregular past participle
abrir - abierto
entreabrir - entreabierto
reabrir - reabierto
cubrir - cubierto
descubrir - descubierto
encubrir - encubierto
recubrir - recubierto
redescubrir - redescubierto
adscribir - adscrito
circunscribir - circunscri(p)to
describir - descri(p)to
escribir - escrito
inscribir - inscri(p)to
manuscribir - manuscrito
prescribir - prescri(p)to
proscribir - proscri(p)to
sobrescribir - sobrescri(p)to
subscribir - subscri(p)to
transcribir - transcri(p)to
Verbs that have an irregular past participle as well as a regular one
absorber - absorto
afligir* - aflicto
asumir - asunto
circuncidar - circunciso
compeler - compulso
comprimir - compreso
confundir - confuso
consumir - consunto
contundir - contuso
convencer - convicto
corromper - corrupto
descontentar - descontento
difundir - difuso
dispersar - disperso
dividir - diviso
enjugar - enjuto
eximir - exento
expeler - expulso
expresar - expreso
extinguir - extinto
fijar - fijo
hartar - harto
imprimir - impreso
incurrir - incurso
infundir - infuso
injertar - injerto
insertar - inserto
intermitir - intermiso
matar - muerto
omitir - omiso
oprimir - opreso
prefijar - prefijo
prender - preso
presumir - presunto
reimprimir - reimpreso
romper - roto
suspender - suspenso
* "g" changes into "j" when it precedes an "a"
