A guy is singing into a microphone.
A man is not using a microphone.
A man singing into a microphone is using it, he is not not using it.
exists e1 x1 x2.(into(e1,x2) & n_microphone(x2) & Actor(e1,x1) & v_sing(e1) & n_guy(x1))
exists x1.(-exists e1 x2.(Theme(e1,x2) & Actor(e1,x1) & v_use(e1) & n_microphone(x2)) & n_man(x1))