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.
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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