Los chicos han tomado el examen de química.
The boys have taken the chemistry exam
I have eaten a cookie.
He comido una galleta.
Vosotros héis decidido algo importante. Y'all have decided something important.
héis --> habéis
Vosotros is the only verb form of haber that looks like it has a "regular" stem.
ver
visto, seen
escribir
escrito, written
Nuestra familia ha adoptado un gato nuevo.
Our family has adopted a new cat.
We have gone to Disney World a lot.
Hemos ido a Disney World mucho.
He no visto la película nueva de Batman. I haven't seen the new Batman movie.
he no visto --> no he visto (word order)
You cannot separate the form of "haber" from the participle.
decir
dicho, said
ir
ido, gone
Mi novio ha bebido mucho café hoy.
My boyfriend has drunk(drank?) a lot of coffee today.
My parents have lived in Indianapolis for many years.
Mis padres han vivido en Indianapolis por muchos años.
Yo he escribido una carta a Papá Noel. I have written a letter to Santa.
escribido --> escrito
This is an irregular participle for "escribir"
poner
puesto, put
romper
roto, broken
J.K. Rowling ha escrito un libro nuevo.
J.K. Rowling has written a new book.
Have you seen my phone?
¿Has visto mi teléfono? (móvil, celular, etc.)
Elena y Emilia han sidas amigas por muchos años. Elena and Emilia have been friends for many years.
sidas--> sido
although the subject is feminine plural, the participle will still end with an "o", because it is not an adjective that describes the subject
descubrir
descubierto, discovered
hecho, done/made
(both definitions for points :) )
Nosotros nos hemos puesto los uniformes para el partido de fútbol.
We have put on (ourselves) our uniforms for the soccer game.
My dog has broken his leg.
Mi perro ha roto su pierna.
No he cepilladome los dientes hoy. I haven't brushed my teeth today.
No he cepillado me --> no me he cepillado
object pronouns and reflexive pronouns come before the form of haber, and after the "no" if the sentence is negative.morir
muerto, died
abrir
abierto, opened