A boy pushes another child in a kid-sized car.
A boy pushes another boy in a small car down a hill
Pushing a child in a car does not imply it being down a hill.
exists e1 s1 x1 x2 x3 x4.(n_child(x2) & in(e1,x4) & n_car(x4) & a_kid-sized(s1) & Theme(s1,x4) & Theme(e1,x3) & Actor(e1,x1) & v_push(e1) & n_child(x3) & -(x3 = x2) & n_boy(x1))
exists e1 s1 x1 x2 x3 x4.(in(e1,x3) & down(x3,x4) & n_hill(x4) & n_car(x3) & a_small(s1) & Theme(s1,x3) & Theme(e1,x2) & Actor(e1,x1) & v_push(e1) & n_boy(x2) & -(x2 = x1) & n_boy(x1) & n_boy(x1))