I have a question about present tense opinions of completed past actions. I know the for the English phrase, "I don't think we have done anything wrong to regret", one says, "No creo que hayamos hecho nada malo para arrepentirnos." However, if one changes the English phrase to, "I don't think we had done anything wrong to regret", shouldn't the translation change to, "No creo que hubieramos hecho nada malo para arrepentirnos"? Google does not change el preterito perfecto de subjuntivo to el pluscuamperfecto de subjuntivo for this nuance. I think it should. Don't know if this is addressed anywhere else on this site. Can you comment for my benefit?
This is a tricky one. When we want to say that "you don't think something has happened" in Spanish, the more direct translation would be that using the present perfect subjunctive "...que hayamos hecho..." and to go further back in time, as in "that we had done" we would still use the same "...que hayamos hecho" although you can also use "...que hubiéramos hecho..." If we decide to use the pluperfect subjunctive with hubiéramos, I think we'd want to convey, more than the "anteriority", the "uncertainty", as if we were saying "I don't think we had done something wrong (at least we don't think so, maybe you do...).
Also, using the pluperfect subjunctive could also change the meaning of the sentence and we would be meaning "that something would have/haven't happened". See this example:
Yo no creo que ella hubiera venido a la fiesta.
I don't think she WOULD HAVE come to the party.
This is not refering to something that "had happened" but that "would/not have happened".
So, as a conclusion to your question, I'd say that you can use it with the pluperfect subjunctive but it doesn't really add any difference to the use of the present perfect subjunctive when you refer to a perfect action in the past; in fact, it'd be more commonly used with the pluperfect when we want to convey something that "would have happened".
I hope this is clear enough to clarify your doubt. A tricky one as I said.
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