A greyhound is active in a grassy field.
The dog is sleeping on the coouch.
One cannot be active while sleeping.
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 x1 x2.(n_coouch(x2) & n_dog(x1) & on(e1,x2) & Actor(e1,x1) & v_sleep(e1))