Conjugate Spanish irregular verbs in the perfect conditional tense in Spanish (El Condicional Perfecto)

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El Condicional Perfecto is used in Spanish to say something would have happened

Learn how to conjugate Spanish irregular verbs in El Condicional Perfecto 

yo habría  
habrías  
él / ella / Ud. habría   +  past participle
nosotros  habríamos  
vosotros habríais  
ellos /ellas / Uds.   habrían  

This is how to form El Condicional Perfecto:

haber in the conditional + past participle of second verb

Look at these examples of irregular verbs in El Condicional Perfecto:

Yo habría escrito un libro.I would have written a book.

habrías frito las patatas.You would have fried the potatoes.

Él habría abierto la puerta.He would have opened the door.

Nosotros no habríamos puesto los libros en la mesa.We wouldn't have put the books on the table.

Vosotros habríais resuelto el problema.You would have solved the problem.

Ellos no habrían roto la muñeca.They wouldn't have broken the doll.

Yo no te habría dicho mentiras.I would not have told you lies.

¿Qué habrías hecho tú en mi situación?What would you have done in my situation?

Él no te habría contradicho enfrente de tus alumnos.He wouldn't have contradicted you in front of your pupils.

¿Qué habrían hecho ustedes para ayudarlo?What would you have done to help him?

Notice how the endings of the participles are -to or -cho.

Special case: verb "pudrir/pudrirse" (to rot/to go off)

This verb doesn't change the ending to -to or -cho; it keeps the irregular form -ido, however the -u from the stem changes to -o. 

Pudrir -> podrido

"Si hubieras dejado la carne fuera del frigorífico, se habría podrido."
(If you had left the meat outside the fridge, it would have gone off.)

To revise irregular participles see Spanish irregular past participles ending in -to/-cho 

See also:
1. Conjugate haber in the conditional tense in Spanish (El Condicional Simple) 
2. Irregular past participles in Spanish
3. Spanish double past participles verbs

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Examples and resources

habrías frito las patatas.You would have fried the potatoes.
Nosotros no habríamos puesto los libros en la mesa.We wouldn't have put the books on the table.
Yo no te habría dicho mentiras.I would not have told you lies.
¿Qué habrías hecho tú en mi situación?What would you have done in my situation?
Él no te habría contradicho enfrente de tus alumnos.He wouldn't have contradicted you in front of your pupils.
¿Qué habrían hecho ustedes para ayudarlo?What would you have done to help him?
¿Qué habrían hecho ustedes para ayudarlo?What would you have done to help him?
Yo habría escrito un libro.I would have written a book.
Él habría abierto la puerta.He would have opened the door.
Ellos no habrían roto la muñeca.They wouldn't have broken the doll.
Vosotros habríais resuelto el problema.You would have solved the problem.
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