Fue una lástima que el sacrificio no hubiera funcionado.

Questions & Answers about Fue una lástima que el sacrificio no hubiera funcionado.

Why do we use the past perfect subjunctive (hubiera funcionado) here instead of the imperfect subjunctive (funcionara)?
We use the past perfect subjunctive to show that the sacrifice failing happened before the main action. The main clause Fue una lástima is already in the past. To express that something had not worked before that past moment, we need the past perfect subjunctive: the imperfect subjunctive of haber (hubiera) plus the past participle (funcionado).
What exactly triggers the subjunctive in this sentence?
The trigger is the impersonal expression of emotion or judgment: Fue una lástima que (It was a pity that). Whenever you express an emotion about another subject's action, it requires the subjunctive. Since the main verb Fue is in the past, the following verb must be in a past subjunctive form.
Is it possible to use hubiese instead of hubiera here?
Yes, no hubiese funcionado is grammatically correct and means the exact same thing. However, in Latin America, the -ra endings (like hubiera) are much more commonly used in everyday speech than the -se endings.
Why is the main verb Fue in the preterite tense rather than the imperfect (Era una lástima)?
Using Fue (preterite) treats the feeling of pity as a completed, specific reaction to the event at that moment. You could say Era una lástima (imperfect) if you were setting the scene or describing an ongoing feeling of regret in the past, but Fue makes it a direct, pointed reaction to the sacrifice failing.

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