Two elderly people sing in microphones while playing instruments.
The people are quietly eating.
People cannot be quiet or eat while singing and playing instruments.
exists e1 e2 s1 x1 x2 x3.(while(e1,e2) & Theme(e2,x3) & Actor(e2,x1) & v_play(e2) & n_instrument(x3) & in(e1,x2) & n_microphone(x2) & Actor(e1,x1) & v_sing(e1) & n_people(x1) & a_elderly(s1) & Theme(s1,x1) & card_eq_2(x1))
exists e1 s1 x1.(n_people(x1) & a_quietly(s1) & Manner(e1,s1) & Actor(e1,x1) & v_eat(e1))