Three people singing into a microphone.
The people are singing the national anthem before the big game.
We don't know that the people are singing the national anthem.
exists e1 x1 x2 x3.(a_topic(x1) & into(e1,x3) & n_microphone(x3) & Actor(e1,x2) & v_sing(e1) & (x1 = x2) & n_people(x1) & card_eq_3(x1))
exists e1 s1 s2 x1 x2 x3.(n_game(x3) & a_big(s2) & Theme(s2,x3) & n_anthem(x2) & a_national(s1) & Theme(s1,x2) & n_people(x1) & before(e1,x3) & Theme(e1,x2) & Actor(e1,x1) & v_sing(e1))