Children play in fountains that spray water from the ground.
Nobody is playing.
There can be either children or nobody.
exists e1 x1 x2 x3 x4 x5 x6.(n_ground(x6) & a_topic(x1) & in(x1,x3) & from(e1,x6) & Theme(e1,x5) & Actor(e1,x4) & v_spray(e1) & n_water(x5) & (x3 = x4) & n_fountain(x3) & n_play(x1) & (x1 = x2) & ne_nam_children(x2))
-exists e1 x1.(Actor(e1,x1) & v_play(e1) & n_person(x1))