Apostrophes, like quotation marks, hang out far above the baseline, where they have two main roles: contraction and possession. They also occasionally have a third role: as a marker of the plural.
To find out more—and to test your apostrophe knowledge—take the quiz.
Note: Style guides sometimes disagree. Except for a few details that can be verified in standard dictionaries and encyclopedias and other readily available sources, the answers in this quiz rely on the information in the 17th edition of CMOS.
Chicago Style Workout 65: Apostrophes
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