A guy is singing into a microphone.
A person is singing.
The guy can also be called a person.
exists e1 x1 x2.(into(e1,x2) & n_microphone(x2) & Actor(e1,x1) & v_sing(e1) & n_guy(x1))
exists e1 x1.(Actor(e1,x1) & v_sing(e1) & n_person(x1))