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Pronouns are words like he, she, you, me, who and it, which stand in for another noun. The only way in which they behave any differently from other nouns is when they own something.
When we show that a noun owns something, we use its possessive form, which is made by adding an apostrophe-s (‘s) to the end of it (John’s car = the car that belongs to John), unless it’s a plural ending in s, in which case we just add an apostrophe (my daughters’ birthdays = the birthdays that belong to my daughters).
However, when we show that a pronoun owns something, we don’t add an apostrophe, we use a different word. The car that belongs to me is my car; the house that belongs to you is your house; the laptop that belongs to him is his laptop; and the reputation that belongs to it is its reputation (not it’s).