A baseball player hitting the ball
A baseball player is practicing by hitting a ball.
He may be doing this for fun, not practicing.
exists e1 x1 x2 x3 x4.(n_ball(x4) & a_topic(x1) & Theme(e1,x4) & Actor(e1,x3) & v_hit(e1) & (x1 = x3) & n_player(x1) & of(x1,x2) & n_baseball(x2))
exists e1 e2 x1 x2 x3.(by(e1,e2) & Theme(e2,x3) & Actor(e2,x1) & v_hit(e2) & n_ball(x3) & Actor(e1,x1) & v_practice(e1) & n_player(x1) & of(x1,x2) & n_baseball(x2))