Possessive Apostrophe

The general rule for forming possessives

The general rule is that the possessive of a singular noun is formed by adding an apostrophe and s, whether the singular noun ends in s or not.

Ex) a week’s vacation

Texas’s oil industry

The possessive of a plural noun is formed by adding only an apostrophe when the noun ends in s, and by adding both an apostrophe and s when it ends in a letter other than s.

Ex) the twins’ parents

the alumni’s fundraising

from The Punctuation Guide

Test your knowledge of the possessive apostrophe with a quiz below!

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