Two dogs play in a sandy field.
Two dogs play while their owners watch.
Dogs playing does not imply owners watch.
exists e1 s1 x1 x2.(in(e1,x2) & n_field(x2) & a_sandy(s1) & Theme(s1,x2) & Actor(e1,x1) & v_play(e1) & n_dog(x1) & card_eq_2(x1))
exists e2 e1 x1 x2 x3 x4.(Theme(e2,x4) & Actor(e2,x1) & v_watch(e2) & n_thing(x4) & while(e1,x3) & n_owner(x3) & of(x3,x1) & n_thing(x1) & Actor(e1,x2) & v_play(e1) & (x1 = x2) & n_dog(x1) & card_eq_2(x1))