A man is giving a presentation.
The man is sitting alone reading.
If a presentation is being given, it is not one reading.
exists e1 x1 x2.(Theme(e1,x2) & Actor(e1,x1) & v_give(e1) & n_presentation(x2) & n_man(x1))
exists e1 s1 x1 x2.(n_man(x1) & Theme(e1,x2) & Actor(e1,x1) & v_sit(e1) & n_reading(x2) & a_alone(s1) & Theme(s1,x2))