A boy in a swimsuit sitting on top of a circular fountain.
Nobody is sitting
If nobody is sitting at all then it is impossible for a boy to sitting on top of a fountain
exists e1 s1 x1 x2 x3 x4 x5.(a_topic(x1) & in(x1,x2) & on(e1,x4) & of(x4,x5) & n_fountain(x5) & a_circular(s1) & Theme(s1,x5) & n_top(x4) & Actor(e1,x3) & v_sit(e1) & (x2 = x3) & n_swimsuit(x2) & n_boy(x1))
-exists e1 x1.(Actor(e1,x1) & v_sit(e1) & n_person(x1))