I have the following sentence:
Joe got everyone's attention and started to speak.
Should it be everyone's, everyones' or everyones?
As Robusto says, you should use everyone’s. Neither everyones’ nor everyones is a word.
Note that everyone is always singular and cannot be pluralized, which means everyones is incorrect. If everyones were a word, everyones’ would be the possessive form of everyones, but since everyones is incorrect, everyones’ is also incorrect.
"Everyone's" means "everyone is." Everyones is the possessive, not the plural, form of everyone (everyone is already plural). With pronouns, the apostrophe is not used to indicate possession, e.g., "it's" means "it is" while "its" shows possession (The dog wants its bone).
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