The subject pronouns in English are:
– the subject pronoun always preceeds the verb:
She lives in London
– “I” is always written as a capital letter:
My name is Luca and I am Italian.
– “it” (neutral) is used for things, abstract concepts, animals and plants:
This is my bag. It is very heavy.
– there is just one third person plural pronoun, “they”:
I have many books. They are in my bedroom.