A baseball player prepares to hit the ball.
The baseball player is wearing a football helmet.
A baseball player who prepares to hit the ball would not be wearing a football helmet, but a baseball helmet.
exists e1 p1 x1 x2 x3.(n_ball(x3) & Topic(e1,p1) & Actor(e1,x1) & v_prepare(e1) & exists e2.(Theme(e2,x3) & Actor(e2,x1) & v_hit(e2)) & n_player(x1) & of(x1,x2) & n_baseball(x2))
exists e1 x1 x2 x3 x4.(n_player(x1) & of(x1,x2) & n_baseball(x2) & Theme(e1,x3) & Actor(e1,x1) & v_wear(e1) & n_helmet(x3) & of(x3,x4) & n_football(x4))