Dictionary.com Word FAQs
How do I make the possessive form of a noun?
The possessive of singular nouns ending in s, including nouns ending in s, x, z, ch, or sh, is formed by adding 's, e.g., witness's affidavit. However, if the next word begins with s, then add only an apostrophe, e.g., witness' story. The possessive of singular nouns not ending in s is formed by adding 's, e.g., VIP's seat, baby's food. The apostrophe follows the s of a word with two sibilant sounds, e.g., Kansas', Moses'. The apostrophe is added for the possessive of a noun that is plural in form but singular in meaning, e.g., mathematics' formulas. The apostrophe follows the s for the possessive of plural nouns that end in s, e.g., girls' movies. For the possessive of a plural noun that does not end in s, add 's, e.g., women's rights. For singular proper nouns, add only an apostrophe for the possessive, e.g., Achilles' heel.