I've answered the quiz question: "J'ai peur qu'ils _________ la vérité." with "ne sachent." This was marked incorrect and the correct answer was "sachent." I submitted that as an error, but the response there was to come here and ask why it's incorrect.
I've reviewed the 'ne explétif' lesson over and over and am sure I've lost my mind. In that lesson, "avoir peur que" is NOT marked as depending on whether the phrase is negative and says that it always takes the 'ne'. Can anyone help me understand why my answer is incorrect? Many, many thanks.