The Subjunctivisor!
Does douter require the subjunctive?
Douter may require the subjunctive, depending on whether it is used affirmatively, negatively, or interrogatively:
Par exemple…
Je doute qu’elles sachent son nom.
I doubt they know his name.Je ne doute pas qu’elles ne savent son nom.
I don’t doubt they know his name.Doutes-tu qu’elles ne sachent son nom ?
Do you doubt they know his name?
Why ne in the the second and third examples? It’s the ne explétif.
Also see se douter
The Subjunctivisor! | Subjunctive lesson
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