A child is pushing a tire.
a child pushes a tire down a road
A child is not necessarily pushing a tire down a road.
exists e1 x1 x2.(Theme(e1,x2) & Actor(e1,x1) & v_push(e1) & n_tire(x2) & n_child(x1))
exists e1 x1 x2 x3.(down(e1,x3) & n_road(x3) & Theme(e1,x2) & Actor(e1,x1) & v_push(e1) & n_tire(x2) & n_child(x1))