Hi! In LLPSI, Cap. XI the notion of accusatives with infinitives is introduced, for example: "Puer medicum adesse videt", "Pueri Iuliam canere audiunt", "Dominus servum discedere iubet", "Quintus pedem dolere dicit", "Puerum dormire necesse est". I seem to find three groups in those examples, perhaps by mistake. In the first group, the infinitive simply "describes" the accusative, like an "active" adjective - however grammatically-speaking not true, for example: "Puer medicum adesse videt", "Pueri Iuliam canere audiunt". In the second group, the infinitive describes, or adds to the verb. Like in "Dominus servum discedere iubet". But the third group is what I can't seem to fully understand. Is this a "that" clause, in "Quintus pedem dolere dicit" or "Puerum dormire necesse est"? "Quintus says THAT the foot hurts", "It is a necessity THAT the boy sleeps"? How do you differentiate between those three groups when meeting new verbs? Thank you!