Several children are playing in a fountain.
The children are playing in a field of grass.
In a fountain is not in a field.
exists e1 s1 x1 x2.(in(e1,x2) & n_fountain(x2) & Actor(e1,x1) & v_play(e1) & n_child(x1) & a_several(s1) & Theme(s1,x1))
exists e1 x1 x2 x3.(n_child(x1) & in(e1,x2) & of(x2,x3) & n_grass(x3) & n_field(x2) & Actor(e1,x1) & v_play(e1))