Baseball player throwing the baseball.
The pitcher is working on his slider.
Baseball player throwing the baseball whereas the pitcher do other work.
exists e1 x1 x2 x3.(a_topic(x1) & Theme(e1,x2) & Actor(e1,x3) & v_throw(e1) & n_baseball(x2) & n_baseball(x2) & (x1 = x3) & n_player(x1) & of(x1,x2))
exists e1 x1 x2.(n_slider(x2) & of(x2,x1) & n_male(x1) & n_pitcher(x1) & on(e1,x2) & Actor(e1,x1) & v_work(e1))