There are lots of people walking to go somewhere.
kids are playing in the ground.
One cannot be walking to go somewhere and be playing in the ground at the same time.
exists p1 x1 e1 p2 x2 x3 x4.((x1 = x2) & of(x2,x3) & Topic(e1,p2) & Actor(e1,x4) & v_walk(e1) & exists e2 x5.(Location(e2,x5) & n_location(x5) & Actor(e2,x4) & v_go(e2)) & (x3 = x4) & n_people(x3) & n_lot(x2))
exists e1 x1 x2.(n_ground(x2) & in(e1,x2) & Actor(e1,x1) & v_play(e1) & n_kid(x1))