To express "to have done" something, use the perfect infinitive (infinitivo compuesto). It is formed with the infinitive haber and a past participle.
After prepositions
Use the perfect infinitive after prepositions like por (for) or después de (after) to describe completed actions.
| Thank you for having organized this congress. | Gracias por haber organizado este congreso. |
| After having refuted the presentation, the speaker left. | Después de haber rebatido la ponencia, el ponente salió. |
After conjugated verbs
You can also use it directly after conjugated verbs like sostener or afirmar (to claim) when the subject of both verbs is the same.
| The researcher claims to have used a new approach. | El investigador sostiene haber usado un nuevo enfoque. |
| The speaker claims to have explained the approach of her research. | La ponente afirma haber explicado el enfoque de su investigación. |
Negative perfect infinitive
To say that someone did not do something, place no directly before haber.
| The expert, who is here, regrets not having explained the theory. | El experto, el cual está aquí, lamenta no haber explicado la teoría. |
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