The dog is running in a field.
The dog is sitting on the couch.
a dog cannot be both sitting and running at the same time
exists e1 x1 x2.(n_dog(x1) & in(e1,x2) & n_field(x2) & Actor(e1,x1) & v_run(e1))
exists e1 x1 x2.(n_couch(x2) & n_dog(x1) & on(e1,x2) & Actor(e1,x1) & v_sit(e1))