A man wearing a headset is giving a presentation.
Someone is talking.
Talking is one part of giving a presentation.
exists e2 e1 x1 x2 x3 x4.(Theme(e2,x4) & Actor(e2,x1) & v_give(e2) & n_presentation(x4) & Theme(e1,x3) & Actor(e1,x2) & v_wear(e1) & n_headset(x3) & (x1 = x2) & n_man(x1))
exists e1 x1.(Actor(e1,x1) & v_talk(e1) & n_person(x1))