Cualquiera que ayude tendrá un regalo.
[the speaker doesn't know how many people may help]
[Anyone who may help will have a present]
No dejes entrar a cualquier animal que se acerque a la puerta.
[the speaker doesn't know which animals will approach, it's a future possibility]
[Don't let in any animal that comes near the door]
Comoquiera que lo haga, lo hará bien.
[no experimentado, futuro]
[However he may do it, he'll do it well]