many people carry their drums.
A man is singing all alone.
People refer to many persons  while man is one person
exists e1 x1 x2.(Theme(e1,x2) & Actor(e1,x1) & v_carry(e1) & n_drum(x2) & of(x2,x1) & n_thing(x1) & n_people(x1) & n_quantity(x1))
exists x1.(all x2.(n_thing(x2) -> exists e1.(Theme(e1,x2) & Actor(e1,x1) & v_sing(e1) & r_alone(x2))) & n_man(x1))