A boy chasing a baseball.
A boy is running
In order for the boy to be chasing a baseball, he must be running.
exists e1 x1 x2 x3.(a_topic(x1) & Theme(e1,x3) & Actor(e1,x2) & v_chase(e1) & n_baseball(x3) & (x1 = x2) & n_boy(x1))
exists e1 x1.(Actor(e1,x1) & v_run(e1) & n_boy(x1))