A boy in a ball uniform is hitting third base.
A boy is playing baseball.
Being on a base does not indicate that the boy is playing baseball.
exists e1 s1 x1 x2 x3 x4.(Theme(e1,x4) & Actor(e1,x1) & v_hit(e1) & n_base(x4) & a_third(s1) & Theme(s1,x4) & in(x1,x2) & n_uniform(x2) & of(x2,x3) & n_ball(x3) & n_boy(x1))
exists e1 x1 x2.(Theme(e1,x2) & Actor(e1,x1) & v_play(e1) & n_baseball(x2) & n_boy(x1))