A pitcher is pitching a baseball to a catcher, who is standing in front of an umpire and behind a batter.
a pitcher is pitching
A pitcher is pitching is same as  a pitcher is pitching
exists e1 e2 e3 x1 x2 x3 x4 x5 x6 x7 x8.(to(e1,x3) & behind(e3,x8) & n_batter(x8) & Actor(e3,x7) & v_stand(e3) & (x3 = x7) & in(e2,x5) & of(x5,x6) & n_umpire(x6) & n_front(x5) & Actor(e2,x4) & v_stand(e2) & (x3 = x4) & n_catcher(x3) & Theme(e1,x2) & Actor(e1,x1) & v_pitch(e1) & n_baseball(x2) & n_pitcher(x1))
exists e1 x1.(Actor(e1,x1) & v_pitch(e1) & n_pitcher(x1))