The boy is riding on a toy truck.
Child having fun with a truck.
The boy has fun with the truck.
exists e1 x1 x2 x3.(n_boy(x1) & on(e1,x2) & n_truck(x2) & of(x2,x3) & n_toy(x3) & Actor(e1,x1) & v_ride(e1))
exists e1 x1 x2 x3 x4.(a_topic(x1) & with(e1,x4) & n_truck(x4) & Theme(e1,x3) & Actor(e1,x2) & v_have(e1) & n_fun(x3) & (x1 = x2) & n_child(x1))