A greyhound is active in a grassy field.
The dog is playing fetch.
The fact that the dog is active in a field doesn't imply dog is playing fetch.
exists s1 s2 x1 x2.(in(s1,x2) & n_field(x2) & a_grassy(s2) & Theme(s2,x2) & Theme(s1,x1) & a_active(s1) & n_greyhound(x1))
exists e1 s1 x1.(n_dog(x1) & a_fetch(s1) & Manner(e1,s1) & Actor(e1,x1) & v_play(e1))