These three pronouns are third-person singular subject pronouns in the English language. 'He' and 'she' are the only gender-specific pronouns in English.
'He' mainly refers to a male person, and 'she' to a female person.
'it' is a little more complicated. Not only is it used to refer to objects and non-human things, but it can also be used to refer to humans (male or female). Let's get to it.
'It' Referring to Humans
Normally 'it' is used to refer to an animal or a thing. However, in some contexts, 'it' can be used to refer to people. For example:
- When we want to talk about a baby, especially one that we don't know their gender
My husbands hopes
- When we want to identify a person or telling someone who you are (especially on the phone or at the door)