A group of people are listening to a presentation.
A group of people having lunch in a cafeteria
Having lunch is not the same as listening.
exists e1 x1 x2 x3.(to(e1,x3) & n_presentation(x3) & Actor(e1,x1) & v_listen(e1) & of(x1,x2) & n_people(x2) & n_group(x1))
exists e1 x1 x2 x3 x4 x5.(a_topic(x1) & of(x1,x2) & in(e1,x5) & n_cafeteria(x5) & Theme(e1,x4) & Actor(e1,x3) & v_have(e1) & n_lunch(x4) & (x2 = x3) & n_people(x2) & n_group(x1))