14 Unnecessary or missing apostrophe (including its/it’s)

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To make a noun possessive, add either an apostrophe and an -s (Ed’sbook) or an apostrophe alone (the boys’ gym). Do not use an apostrophe in the possessive pronouns ours, yours, and hers. Use its to mean belonging to it; use it’s only when you mean it is or it has. (See Chapter 42.)