Nouns
Pronouns
The possessive case of nouns is formed with an apostrophe: Keesha's costume, the wolf's fangs. But personal pronouns and the relative pronoun who change form to indicate possession.
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My house is bigger than your house.
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His anger evaporated in the face of her explanation.
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The bulldog bared its teeth at us.
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Our decision affected their plans.
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The economist, whose book had received good reviews, agreed to speak.
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No mother tried harder to help than hers.
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Your plans are more definite than ours.
Remember that possessive-case nouns and pronouns are different; possessive pronouns do not have apostrophes. You have to distinguish between its, it's, and whose, who's. The possessive of it is its, not it's; the possessive of who is whose, not who's. It's and who's are contractions (it's = it is; who's = who is).
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The cat lost its whiskers. ( not it's whiskers)
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It's ( It is) Friday!
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The boy whose mother ( not who's mother) called left the meeting.
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Who's ( Who is) the author of the book?
