If I'm right, indirect questions are the question side of indirect statements, though they use subjunctive verbs and not the Accusative + Infinitive construction. My question is this:
Vident quid faciat. = They see what he is doing.
But vident is a complete thought in itself, so why does Latin not say:
Vident quod faciat.
Also, if I want to say, 'We know who she is,' is this correct:
Nescimus quis sit.