The boys are playing soccer.
Boys are playing cards in the cafeteria.
Playing soccer is different from playing cards.
exists e1 x1 x2.(n_boy(x1) & Theme(e1,x2) & Actor(e1,x1) & v_play(e1) & n_soccer(x2))
exists e1 x1 x2 x3.(n_cafeteria(x3) & in(e1,x3) & Theme(e1,x2) & Actor(e1,x1) & v_play(e1) & n_card(x2) & n_boy(x1))