0 used as the subject of the verb when meaning a group of people, animals, or things that have already been talked about -- essi, esse, loro
1 used to refer to a person when you want to avoid saying ‘he’ or ‘she’ or when you do not know if the person is male or female -- usato per parlare di qualcuno quando si vuole evitare l’uso di “he” o “she” o se non si sa se la persona è uomo o donna
3 persons, animals or things already spoken about, being pointed out etc -- essi, esse, loro
They are in the garden.
4 used instead of he, he or she etc when the person’s sex is unknown or when people of both sexes are being referred to -- (lui), (lei)
If anyone does that, they are to be severely punished.