Possessives are used with nouns and pronouns in relation to people, countries and animals. They are used to show a relationship of possession.
1 – With singular nouns use –‘s; with plural nouns ending in s use –‘ only; with plural nouns not ending in s use –s’
2 – With possessive pronouns do not use an apostrophe, as they already show possession.
3 – Possessive adjectives are used to show something belongs to somebody, for parts of the body, for relations and friends. It modifies a noun to show ownership.
4 – Possessive question: whose, is used to find out whether something belongs to someone.