A little boy playing with his toy.
the dog ran  after the  car.
A little boy and a dog are two different individuals
exists e1 s1 x1 x2 x3.(a_topic(x1) & with(e1,x3) & n_toy(x3) & of(x3,x1) & n_male(x1) & Actor(e1,x2) & v_play(e1) & (x1 = x2) & n_boy(x1) & a_little(s1) & Theme(s1,x1))
exists e1 x1 x2.(n_car(x2) & n_dog(x1) & after(e1,x2) & Actor(e1,x1) & v_run(e1))