A black dog retrieves a bird.
The black dog retrieves a bird after his master shot it.
The black dog retrieves a bird but that doesn't necessarily mean that his master shot it.
exists e1 s1 x1 x2.(Theme(e1,x2) & Actor(e1,x1) & v_retrieve(e1) & n_bird(x2) & n_dog(x1) & a_black(s1) & Theme(s1,x1))
exists e1 p1 s1 x1 x2 x3.(n_thing(x1) & n_master(x3) & of(x3,x1) & n_male(x1) & n_dog(x1) & a_black(s1) & Theme(s1,x1) & exists e2.(Theme(e2,x1) & Actor(e2,x3) & v_shoot(e2)) & after(e1,p1) & Theme(e1,x2) & Actor(e1,x1) & v_retrieve(e1) & n_bird(x2))