Some kids play in a field.
Some men play in a field.
Kids are not the same as men.
exists e1 x1 x2.(in(e1,x2) & n_field(x2) & Actor(e1,x1) & v_play(e1) & n_kid(x1))
exists e1 x1 x2.(in(e1,x2) & n_field(x2) & Actor(e1,x1) & v_play(e1) & n_man(x1))