The present perfect subjunctive ( el pretérito perfecto de subjuntivo ) is used to describe past actions that are connected to the present, as well as actions that will have happened by a certain point in the future.
The present perfect subjunctive is a combination of the present subjunctive of the verb haber and a past participle. It's very similar to the present perfect indicative, but is triggered by the same sorts of words and phrases as the present subjunctive.
The present perfect subjunctive is formed as follows:
present subjunctive of haber + past participle
Here's how to form haber in the present subjunctive.
haya hayas haya hayamos hayáis hayanThe present perfect subjunctive is used to talk about past actions connected to the present, as well as actions that will have been completed in the future. Certain words and phrases, such as those expressing emotions and desires, trigger the use of the present perfect subjunctive.
The present perfect subjunctive can be used to talk about actions that happened in the past but are relevant in the present. It's very common to see it used to talk about things that just happened.