A boy on a water slide
The boy is cooking dinner.
The boy cannot be on a slide and cooking dinner at the same time.
exists x1 x2 x3.(a_topic(x1) & on(x1,x2) & n_slide(x2) & of(x2,x3) & n_water(x3) & n_boy(x1))
exists p1 x1.(n_boy(x1) & exists s1 x2.((x1 = x2) & n_dinner(x2) & a_cooking(s1) & Theme(s1,x2)))