Teenagers at a field playing a sport.
The teenagers are playing basketball.
Not all sport is basketball.
exists e1 x1 x2 x3.(Theme(e1,x3) & Actor(e1,x1) & v_play(e1) & n_sport(x3) & at(x1,x2) & n_field(x2) & n_teenager(x1))
exists e1 x1 x2.(n_teenager(x1) & Theme(e1,x2) & Actor(e1,x1) & v_play(e1) & n_basketball(x2))