A child petting a dog.
a small kid is playing fetch with his pet.
The child petting a dog is not necessarily playing fetch and not all dogs being petted are pets.
exists e1 x1 x2 x3.(a_topic(x1) & Theme(e1,x3) & Actor(e1,x2) & v_pet(e1) & n_dog(x3) & (x1 = x2) & n_child(x1))
exists e1 s1 x1 x2 x3.(with(e1,x3) & n_pet(x3) & of(x3,x1) & n_male(x1) & Theme(e1,x2) & Actor(e1,x1) & v_play(e1) & n_fetch(x2) & n_kid(x1) & a_small(s1) & Theme(s1,x1))