A dog looks behind itself.
A cat looks backwards.
It is either a dog or a cat.
exists e1 x1.(behind(e1,x1) & n_thing(x1) & Actor(e1,x1) & v_look(e1) & n_dog(x1))
exists e1 x1 x2.(Theme(e1,x2) & Actor(e1,x1) & v_look(e1) & n_backward(x2) & n_cat(x1))