Lingua Latina Per Se Illustrata. Capitulum Tertium.
Tractatus Brevis et Exercitationes de Objectis Directis et de Casu Accusativo.
Discussion in English and exercises in Latin.
(Word order isn't the most natural Latin one in every slide; on the contrary, I've purposely mixed it up a bit, in order to emphasize the morphology (the forms/endings). Note also that "quis est?" means (as you know) "who is?" There's a slightly different way to say "which one is it?", but we haven't had that, so "quis est?" is fine for now.)