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What are the rules for apostrophes?

Answer:

An apostrophe followed by the letter s at the end of a noun signifies possessive case. The mark followed by an s also pluralizes letters of the alphabet, figures, and words discussed as words. Within contracted words, apostrophes replace the eliminated letters.

First answer by ID3565420554. Last edit by JayveeRouge. Contributor trust: 347 [recommend contributor recommended]. Question popularity: 11 [recommend question].