A black dog retrieves a bird.
The black dog sits quietly.
The dog retrieves a bird instead of it sits quietly.
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 s1 s2 x1.(n_dog(x1) & a_black(s1) & Theme(s1,x1) & a_quietly(s2) & Manner(e1,s2) & Actor(e1,x1) & v_sit(e1))