A baseball player swings to hit the ball as an umpire crouches behind him.
The baseball player is wearing a hat.
Not all baseball players wear a hat.
(x)
exists e1 x1 x2 x3.(n_player(x1) & of(x1,x2) & n_baseball(x2) & Theme(e1,x3) & Actor(e1,x1) & v_wear(e1) & n_hat(x3))