premise: A man is giving a presentation.
hypothesis: the man is not talking
explanation_1: A man can't go about giving a presentation by not talking.
explanation_2: Giving a presentation typically involves talking.  Giving a presentation without talking is contradictory.
explanation_3: Presentation involves talking.
premise_logic: exists e1 x1 x2.(Theme(e1,x2) & Actor(e1,x1) & v_give(e1) & n_presentation(x2) & n_man(x1))
hypothesis_logic: exists x1.(n_man(x1) & -exists e1.(Actor(e1,x1) & v_talk(e1)))
premise_sim: exists e1 x1 x2.(v_give(e1) & n_presentation(x2) & n_man(x1) & Theme(e1,x2) & Actor(e1,x1))
hypothesis_sim: exists x1.(n_man(x1) & all e1.(-v_talk(e1) | -Actor(e1,x1)))