I am trying to help you but I am kinda confused on how you are asking. I am so sorry!
You can use it when the actor is unknown or when the actor is <span> irrelevant. hope this helped :)</span>
Boys and girls should both have to do house work because of respect fro themselves. Both sex's can be responsible enough to pick up there own mess.. no sex is better at something your better as something when you pick your as* up and keep on trying at that the thing your trying for.