Je doute qu'il ait compris la question.
English: I doubt that he understood the question.
The 'subjonctif passé' is a French verb tense used to express actions that are uncertain, possible, or subjective, but that happened before the present moment or before another action.
Use the subjonctif passé in French when you want to talk about something that may have happened in the past, especially after expressions of doubt, emotion, necessity, or possibility. It is often used when the main clause is in the present and the action in the subordinate clause happened before.
Je doute qu'il ait compris la question.
English: I doubt that he understood the question.
Il est possible qu'elle soit arrivée en retard.
English: It is possible that she arrived late.
Je suis content que tu aies réussi.
English: I am happy that you succeeded.
Bien qu'ils aient terminé, ils restent prudents.
English: Although they finished, they remain careful.