Two boys play in a park fountain.
The boys don't have on any shoes.
Boys playing in a park fountain could be wearing shoes.
exists e1 x1 x2 x3.(in(e1,x2) & n_fountain(x2) & of(x2,x3) & n_park(x3) & Actor(e1,x1) & v_play(e1) & n_boy(x1) & card_eq_2(x1))
exists x1.(n_boy(x1) & -exists e1 x2.(all x3.(n_shoe(x3) -> on(e1,x3)) & Theme(e1,x2) & Actor(e1,x1) & v_have(e1) & n_thing(x2)))