Two basketball players struggle for the ball.
The basketball player struggled not to drop the ball.
Two refers two basketball players and not just one basketball player. Both basketball players could have been struggling to not drop the ball.
exists x1 x2 x3 x4.(n_ball(x4) & a_topic(x1) & for(x1,x4) & Time(x1,x3) & n_struggle(x3) & n_player(x1) & of(x1,x2) & n_basketball(x2) & card_eq_2(x1))
exists x1 x2 x3.(n_ball(x3) & n_player(x1) & of(x1,x2) & n_basketball(x2) & -exists e1 p1.(Topic(e1,p1) & Actor(e1,x1) & v_struggle(e1) & exists e2.(Theme(e2,x3) & Actor(e2,x1) & v_drop(e2))))