Three people sing into a microphone.
Three people are singing karaoke.
Not all people singing into a microphone are singing karaoke
exists e1 x1 x2.(into(e1,x2) & n_microphone(x2) & Actor(e1,x1) & v_sing(e1) & n_people(x1) & card_eq_3(x1))
exists e1 x1 x2.(Theme(e1,x2) & Actor(e1,x1) & v_sing(e1) & n_karaoke(x2) & n_people(x1) & card_eq_3(x1))