Spanish · Chapter 29 · Lesson 8 · Grammar primer
The perfect subjunctive: haya hablado
The present subjunctive of haber plus a participle - haya hablado - for a finished action under a present trigger: espero que hayas llegado, no creo que lo haya hecho, and cuando hayas terminado for the future perfect.
The short version
It is haya, never ha
If the clause needs the subjunctive, the auxiliary is haya, not the indicative ha. No creo que ha llegado is the classic slip. And haya answers to a present or future trigger only: once the main verb slides into the past, no creía que, you have to drop to hubiera llegado instead.
No creo que haya llegado todavía.
The tense that does English's will have done
The second home for this tense surprises English speakers. After cuando, en cuanto, hasta que and después de que, an action that will be finished before the main event takes the perfect subjunctive. It does the job English hands to 'will have done', and the two languages line up neatly: when you have finished, call me.
Cuando hayas terminado, llámame.
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