A man is balancing a metal ball on his arm.
A man is balancing a metal ball as a demonstration to his students.
Balancing a metal ball does not imply it is as a demonstration.
exists e1 x1 x2 x3 x4.(Theme(e1,x2) & Actor(e1,x1) & v_balance(e1) & on(x2,x4) & n_arm(x4) & of(x4,x1) & n_male(x1) & n_ball(x2) & of(x2,x3) & n_metal(x3) & n_man(x1))
exists e1 x1 x2 x3 x4 x5.(Theme(e1,x2) & Actor(e1,x1) & v_balance(e1) & to(x2,x5) & n_student(x5) & of(x5,x1) & n_male(x1) & as(x2,x4) & n_demonstration(x4) & n_ball(x2) & of(x2,x3) & n_metal(x3) & n_man(x1))