The past perfect of the subjunctive mood is formed using the formula below:

past subjunctive conjugation of haber + the past participle = past perfect subjunctive

The past subjunctive conjugation of haber is shown below and to the right. There are two distinct forms.

haber (full conjugation)

yo	hubiera
tú	hubieras
él/ella/Ud.	hubiera
nosotros (as)	hubiéramos
vosotros (as)	hubierais
ellos/ellas/ Uds.	hubieran

OR

yo	hubiese
tú	hubieses
él/ella/Ud.	hubiese
nosotros (as)	hubiésemos
vosotros (as)	hubieseis
ellos/ellas/ Uds.	hubiesen

The past participle is formed by adding the suffix -ado to -ar verbs and -ido to -er and -ir verbs.

Example: the past participle of hablar (to speak) is hablado. The tables below shows the conjugation of hablar in the past perfect subjunctive:

hubiera hablado	(I had spoken)
hubieras hablado	(you had spoken)
hubiera hablado	(he/she/you had spoken)
hubiéramos hablado	(we had spoken)
hubierais hablado	(you guys had spoken)
hubieran hablado	(you all/they had spoken)

OR

hubiese hablado	(I had spoken
hubieses hablado	(he/she/you had spoken)
hubiese hablado	(he/she/you had spoken
hubiésemos hablado	(we had spoken)
hubieseis hablado	(you guys had spoken
hubiesen hablado	(you all/they had spoken)