A man playing with a black dog on a white blanket.
They are playing fetch
Not all man playing with a black dog on a white blanket are playing fetch.
exists e1 s1 s2 x1 x2 x3 x4.(a_topic(x1) & with(e1,x3) & on(x3,x4) & n_blanket(x4) & a_white(s2) & Theme(s2,x4) & n_dog(x3) & a_black(s1) & Theme(s1,x3) & Actor(e1,x2) & v_play(e1) & (x1 = x2) & n_man(x1))
exists e1 s1 x1.(n_thing(x1) & a_fetch(s1) & Manner(e1,s1) & Actor(e1,x1) & v_play(e1))