As Someone Who Has or Have

Is it you who have or you who has?

who is third-person singular, so it takes has. you is second-person, so it takes have.

Is it everyone who has or everyone who have?

So, is it “everyone has” or “everyone have”? The correct form is “everyone has.” There are very few cases where “everyone” would ever be followed by “have,” but, for the most part, you will always use the singular “has.”