Dog digs in sand
A big animal digging
Not every big animal digging needed to be a dog
exists e1 x1 x2.(ne_nam_dog(x1) & in(e1,x2) & n_sand(x2) & Actor(e1,x1) & v_dig(e1))
exists s1 x1 x2.(a_topic(x1) & n_digging(x1) & of(x1,x2) & n_animal(x2) & a_big(s1) & Theme(s1,x1))