# 44. Conditional Perfect Tense

> Source: [YouTube](https://youtube.com/watch?v=YHDZSHCt1DE&t=12051s)

The conditional perfect describes what *would have* happened or what one *would have* done. It's formed with the conditional of `haber` + a past participle.

## Key Rules
- Form: **conditional of `haber` + past participle**.
- Endings of `haber` follow the regular conditional pattern (`-ía, -ías, -ía, -íamos, -íais, -ían`).
- Past participle does **not** change to agree with subject (it's part of a compound verb).
- Common use: an action that **would have happened but didn't**.
- Pairs with the pluperfect subjunctive in contrary-to-fact `si` clauses: *Si hubiera estudiado, habría aprobado.*

## Conjugation / Pattern Tables

### `haber` (conditional) + participle
| Pronoun | haber | example |
|---|---|---|
| yo | habría | habría terminado |
| tú | habrías | habrías comido |
| él/ella | habría | habría abierto |
| nosotros | habríamos | habríamos vivido |
| vosotros | habríais | habríais hecho |
| ellos | habrían | habrían dicho |

## Examples
| Spanish | English |
|---|---|
| Yo habría terminado mi trabajo. | I would have finished my work. |
| Tú habrías disfrutado estar ahí. | You would have enjoyed being there. |
| Ella habría abierto las ventanas. | She would have opened the windows. |
| Nosotros habríamos comido más. | We would have eaten more. |
| Ellos habrían venido a la fiesta. | They would have come to the party. |
| Yo habría dicho la verdad. | I would have told the truth. |
| ¿Habrías hecho lo mismo? | Would you have done the same? |

## Notes & Gotchas
- Don't confuse `habría` (conditional perfect) with `había` (pluperfect indicative) or `habría` vs. `habrá` (future perfect).
- Irregular participles still apply: `abierto`, `dicho`, `hecho`, `escrito`, `puesto`, `visto`, `vuelto`, `roto`, `muerto`.
- Rare in spoken Spanish — recognize it but don't worry about over-using it.