Tricky Apostrophes

In my e-book, I mention that apostrophes make words possessive or appear in contractions for the missing letters. That means the following words, even if they look incorrect, are actually correct:

  • URLs
  • MRIs
  • PhDs
  • ABCs
  • 123s
  • FAQs
  • 30s
  • dos and don’ts
  • ifs and buts
  • yeses and nos
  • thank-yous
  • And yes, even those terrifying ROUSes

Princess Bride

The only exception I can find is making one lower case letter a plural, such as “mind your p’s and q’s” (The Chicago Manual of Style, 7.14).

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