Use "apostrophe ‑s" to form plurals only when absolutely necessary. Use just an ‑s (or ‑es) to form the plurals of dates, acronyms, and families:
She longed for the 1960s. The investors contributed to their IRAs. The Elmores came for dinner.
But:
Be sure to dot your i's and cross your t's. Here are the do's and don'ts.
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Next: Chapter 12 - Quotation Marks
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