Two dogs chase a third dog with a toy.
the dogs are playing
Chasing with a toy would imply playing.
exists e1 s1 x1 x2 x3.(Theme(e1,x2) & Actor(e1,x1) & v_chase(e1) & with(x2,x3) & n_toy(x3) & n_dog(x2) & a_third(s1) & Theme(s1,x2) & n_dog(x1) & card_eq_2(x1))
exists e1 x1.(n_dog(x1) & Actor(e1,x1) & v_play(e1))