* I: First-person singular subject pronoun. It refers to the speaker.
* You: Second-person singular/plural pronoun. It refers to the person or people being addressed.
* Your: Second-person singular/plural possessive adjective. It shows possession by the person or people being addressed.
* Mine: First-person singular possessive pronoun. It shows possession by the speaker.
* Theirs: Third-person plural possessive pronoun. It shows possession by people who are not the speaker or the person being addressed.
* Them: Third-person plural object pronoun. It refers to people who are not the speaker or the person being addressed, and it's used as the object of a verb or preposition.