A man speaking at a conference.
A professor is giving a presentation at an academic retreat.
Not all men are a professor.  Not all conferences are an academic retreat.
exists x1 x2 x3.(a_topic(x1) & at(x1,x3) & n_conference(x3) & n_speaking(x1) & of(x1,x2) & n_man(x2))
exists e1 s1 x1 x2 x3.(at(e1,x3) & n_retreat(x3) & a_academic(s1) & Theme(s1,x3) & Theme(e1,x2) & Actor(e1,x1) & v_give(e1) & n_presentation(x2) & n_professor(x1))