Three children playing with a ball on a beach.
Nobody is playing.
It cannot be that three children are playing and nobody is playing simultaneously
exists e1 x1 x2 x3 x4.(a_topic(x1) & with(e1,x3) & on(x3,x4) & n_beach(x4) & n_ball(x3) & Actor(e1,x2) & v_play(e1) & (x1 = x2) & n_child(x1) & card_eq_3(x1))
-exists e1 x1.(Actor(e1,x1) & v_play(e1) & n_person(x1))