The indefinite pronoun 'everyone' is a singular pronoun. Would the noun following everyone's be plural? There are actually two issues concerning this topic:
Everyone who is coming will receive a gift. Unless of course you’re a buddhist or a cat, in which case everyone has multiple lives and both would be correct, depending on context. What would be correct in this case and why?
Joe got everyone's attention and started to speak. There is a comprehensive article on the topic on grammar girl: Should it be everyone's, everyones' or everyones? Your deduction, that not everybody's cup of tea means not to everyone's liking, is absolutely correct.
An example would be it flew over everyone's heads, or it flew over everyone's head. The indefinite pronoun 'everyone' is a singular pronoun that takes a singular verb.examples: The possessive of everyone is everyone's, in the same way the possessive of everybody is everybody's. I have the following sentence:
Are the words everyone and everybody singular or plural? The possessive form is everyone's (the form everyones' is incorrect).example: May i have everyone's attention,. In fact, to catch someone's eye is an idiom, not eyes. the question is not about everyone being singular or plural.