A boy chasing a baseball.
A boy chasing a rabbit.
One cannot chase a baseball and a rabbit simultaneously
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 x2 x3.(a_topic(x1) & Theme(e1,x3) & Actor(e1,x2) & v_chase(e1) & n_rabbit(x3) & (x1 = x2) & n_boy(x1))