There is a comprehensive article on the topic on grammar girl: Are the words everyone and everybody singular or plural? The indefinite pronoun 'everyone' is a singular pronoun.
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. The possessive of everyone is everyone's, in the same way the possessive of everybody is everybody's. In fact, to catch someone's eye is an idiom, not eyes. the question is not about everyone being singular or plural.
Joe got everyone's attention and started to speak. May i have everyone's attention,. In my experience, the spelling checkers get confused by contractions. There are actually two issues concerning this topic:
Everyone who is coming will receive a gift. Should it be everyone's, everyones' or everyones? 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:
Your deduction, that not everybody's cup of tea means not to everyone's liking, is absolutely correct. What would be correct in this case and why? Would the noun following everyone's be plural? The expression commonly used in both the affirmative and negative.