A group of children have fun in sack race.
some childrens standing in a park
One is unlikely to race while standing.
exists e1 x1 x2 x3 x4 x5.(Theme(e1,x3) & Actor(e1,x1) & v_have(e1) & in(x3,x4) & n_race(x4) & of(x4,x5) & n_sack(x5) & n_fun(x3) & of(x1,x2) & n_child(x2) & n_group(x1))
exists e1 x1 x2 x3.(a_topic(x1) & in(e1,x3) & n_park(x3) & Actor(e1,x2) & v_stand(e1) & (x1 = x2) & n_children(x1))