a tennis player runs for the ball.
Someone is playing tennis.
A tennis player who runs for the ball can be assumed to be actively playing tennis.
exists e1 x1 x2 x3.(n_ball(x3) & for(e1,x3) & Actor(e1,x1) & v_run(e1) & n_player(x1) & of(x1,x2) & n_tennis(x2))
exists e1 x1 x2.(Theme(e1,x2) & Actor(e1,x1) & v_play(e1) & n_tennis(x2) & n_person(x1))