The black dog is catching a ball, while the white one watches.
Two dogs are taking turns as they play with a ball.
The dogs are not necessarily taking turns.
exists e1 s1 s2 x1 x2 x3.(n_watch(x3) & card_eq_1(x3) & a_white(s2) & Theme(s2,x3) & n_dog(x1) & a_black(s1) & Theme(s1,x1) & while(e1,x3) & Theme(e1,x2) & Actor(e1,x1) & v_catch(e1) & n_ball(x2))
exists e1 p1 x1 x2.(exists e2 x3.(with(e2,x3) & n_ball(x3) & Actor(e2,x1) & v_play(e2)) & n_thing(x1) & as(e1,p1) & Theme(e1,x2) & Actor(e1,x1) & v_take(e1) & n_turn(x2) & n_dog(x1) & card_eq_2(x1))