A boy in a yellow and black coat playing with brown dog.
A boy is playing fetch with a dog.
The fact that a boy is playing with a dog doesn't imply playing fetch.
exists s1 s2 s3 x1 x2 x3 x4.(a_topic(x1) & in(x1,x2) & with(x2,x4) & n_dog(x4) & a_brown(s3) & Theme(s3,x4) & n_playing(x2) & of(x2,x3) & n_coat(x3) & a_black(s2) & Theme(s2,x2) & a_yellow(s1) & Theme(s1,x2) & n_boy(x1))
exists e1 s1 x1 x2.(with(e1,x2) & n_dog(x2) & a_fetch(s1) & Manner(e1,s1) & Actor(e1,x1) & v_play(e1) & n_boy(x1))