Wrong: Everyone needs to grab their own gear.
(Everyone is singular; their is plural.)

Right: Everyone needs to grab his or her own gear.

You can use he as a generic substitute for he or she, but many consider that sexist. We recommend that you alternate between his and her throughout your document to avoid writing his or her every time. If that doesn't work for you, simply rewrite the sentence so you don't need to make the choice. The sample sentence could be rewritten as You need to grab your own gear. Changing the subject to a plural also works: Team members need to grab their own gear.

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