Two guys playing football.
Two guys playing football while skiing.
You can't be playing football and be skiing at the same time.
exists e1 x1 x2 x3.(a_topic(x1) & Theme(e1,x3) & Actor(e1,x2) & v_play(e1) & n_football(x3) & (x1 = x2) & n_guy(x1) & card_eq_2(x1))
exists e1 x1 x2 x3 x4.(a_topic(x1) & while(e1,x4) & n_skiing(x4) & Theme(e1,x3) & Actor(e1,x2) & v_play(e1) & n_football(x3) & (x1 = x2) & n_guy(x1) & card_eq_2(x1))