1. Pluperfect (Pluscuamperfecto)
Forms
Use the imperfect forms of haber with the past participle of the verb to form its pluperfect.
había habíamos estudiado habías habíais florecido había habían vivido
Functions
To express an action that was completed prior to another point in the past.
Muchas civilizaciones ya Many civilizations had habían florecido en América flourished in America antes de before 1492.

2. Review of Conditional + Past Subjunctive in if Clauses - Part 1
Forms
To form the conditional, add these endings to the infinitive.
-ía -íamos -ías -íais -ía -ían
Verbs that have irregular stems in the future have the same stem in the conditional.
decir: dir- poder: podr- querer: querr- hacer: har- poner: pondr- tener: tendr-
To form the past subjunctive, add these endings to the stem of the third-person plural preterite.
extendieron: extendier-
-a -amos -as -ais -a -an

3. Review of Conditional + Past Subjunctive in if Clauses - Part 2
Functions
Use the conditional with the past subjunctive to express ideas or situations that are contrary to fact.
Si pudiera, curaría el SIDA. If I could, I would cure AIDS.
Si pudiera, eliminaría los If I could, I would eliminate prejuicios. prejudices.

4. Future of Probability Forms
To form the future tense, add these endings to the infinitive.
-é -emos -ás -éis -á -án
As with the conditional, several verbs add these endings not to the infinitive but to the following irregular stems.
decir: dir- poner: pondr- hacer: har- querer: querr- poder: podr- tener: tendr-
Functions
To express conjecture or uncertainty about the present or future
–¿Sabes cuándo llega? Do you know when she will arrive?
–Llegará para las doce. She’ll probably arrive around noon.
¿Cuántas horas trabajará al día? How many hours a day do you suppose she works?