A man is playing at a concert.
A woman is sleeping at home
A woman is not a man.  Sleeping at home is not playing at a concert.
exists e1 x1 x2.(at(e1,x2) & n_concert(x2) & Actor(e1,x1) & v_play(e1) & n_man(x1))
exists e1 x1 x2.(at(e1,x2) & n_home(x2) & Actor(e1,x1) & v_sleep(e1) & n_woman(x1))