A man is giving a presentation.
A man is talking aboiut a certain topic with props.
A man is giving a presentation about a certain topic.
exists e1 x1 x2.(Theme(e1,x2) & Actor(e1,x1) & v_give(e1) & n_presentation(x2) & n_man(x1))
exists e1 s1 x1 x2 x3.(aboiut(e1,x2) & with(x2,x3) & n_prop(x3) & n_topic(x2) & a_certain(s1) & Theme(s1,x2) & Actor(e1,x1) & v_talk(e1) & n_man(x1))