With plural nouns ending in “s,” you add the apostrophe after “s” and do not add an additional “s.” For example, the plural noun parents becomes parents’ (not “parent’s” or “parents’s”) in a phrase like “my parents’ car.” An apostrophe can also be used to indicate a contraction (shortening of a word or phrase).

When you add s or es to a noun to form its plural, don’t insert an apostrophe.

Use an apostrophe before s (‘s) if the noun is singular. Examples: The ant’s food storage. Jamie’s wine cellar. You can also use an apostrophe before s (‘s) for irregular plural nouns that do not end in s.

For singular nouns and irregular plurals (those not ending in s), you should add ’s to the end of the word. For plural nouns ending in s, you should add only an apostrophe: the cat’s meow the people’s choice an old wives’ tale