Two large dogs greet other while their owners watch.
the dogs see each other
Dogs greet other must see each other.
exists e2 e1 p1 s1 x1 x2 x3.(Actor(e2,x1) & v_watch(e2) & while(e1,x3) & n_owner(x3) & of(x3,x1) & n_thing(x1) & exists s2.(Theme(s2,x2) & a_other(s2)) & Topic(e1,p1) & Actor(e1,x2) & v_greet(e1) & (x1 = x2) & n_dog(x1) & a_large(s1) & Theme(s1,x1) & card_eq_2(x1))
exists x1.(n_dog(x1) & all x2.(n_other(x2) -> exists e1.(Theme(e1,x2) & Actor(e1,x1) & v_see(e1))))