The name of this tense in Spanish is: "Futuro compuesto".
The construction is:
[SUBJECT] + ['haber' in simple future (habré)] + [PARTICIPLE]
(Yo) había terminado de comer cuando él llegó
I had finished eating when he came
We remember the conjugation of the auxiliary 'haber' in the simple future tense:
| Conjugation | Meaning |
|---|---|
| yo habré | -- |
| tú habrás | -- |
| él habrá | -- |
| nosotros habremos | -- |
| vosotros habréis | -- |
| ellos habrán | -- |
This tense is the equivalent of the future perfect in English and has 2 uses:
En los próximos días, habré terminado mi libro
In the next few days i will have finished my book
Él abra tenido un fin de semana muy atareado
He will have had a busy weekend
To construct the interrogation, change only the position of the subject:
| Affirmation | Interrogation |
|---|---|
| tú habrás comenzado you will have started | ¿habías comenzado (tú)? will you have started? |
To build the negation, add simply the adverb "no" before the verb:
| Affirmation | Negation |
|---|---|
| yo habré dormido I will have slept | yo no habré dormido I will not have slept |