A boy on a water slide
The boy is wearing a bathing suit.
A boy on a water slide is not necessarily wearing a bathing suit.
exists x1 x2 x3.(a_topic(x1) & on(x1,x2) & n_slide(x2) & of(x2,x3) & n_water(x3) & n_boy(x1))
exists e1 x1 x2 x3.(n_boy(x1) & Theme(e1,x2) & Actor(e1,x1) & v_wear(e1) & n_suit(x2) & of(x2,x3) & n_bathing(x3))