A child plays T-ball.
A boy practices t-ball for a game.
Not all children are a boy.  The boy practices before playing, not while playing.
exists e1 x1 x2.(Theme(e1,x2) & Actor(e1,x1) & v_play(e1) & n_t-ball(x2) & n_child(x1))
exists x1 x2 x3 x4.(a_topic(x1) & for(x1,x4) & n_game(x4) & Time(x1,x3) & n_t-ball(x3) & n_practice(x1) & of(x1,x2) & n_boy(x2))