A dog chases a stuffed animal attached to a string.
a dog playing with a toy
The toy can be any type of stuffed animal and chasing something is the same as playing with it.
exists e1 e2 s1 x1 x2 x3 x4.(Theme(e2,x2) & Actor(e2,x1) & v_chase(e2) & to(e1,x4) & n_string(x4) & Theme(e1,x3) & v_attach(e1) & (x2 = x3) & n_animal(x2) & a_stuffed(s1) & Theme(s1,x2) & n_dog(x1))
exists x1 x2 x3.(a_topic(x1) & with(x1,x3) & n_toy(x3) & n_playing(x1) & of(x1,x2) & n_dog(x2))