A little boy swimming underwater with a toy in his hand.
A little boy is chasing a dog.
A little boy can either be chasing a dog, or be swimming underwater.
exists s1 x1 x2 x3 x4 x5.(a_topic(x1) & with(x1,x4) & in(x4,x5) & n_hand(x5) & of(x5,x1) & n_male(x1) & n_toy(x4) & n_underwater(x1) & of(x1,x3) & n_swimming(x3) & of(x1,x2) & n_boy(x2) & a_little(s1) & Theme(s1,x1))
exists e1 s1 x1 x2.(Theme(e1,x2) & Actor(e1,x1) & v_chase(e1) & n_dog(x2) & n_boy(x1) & a_little(s1) & Theme(s1,x1))