Which sentence is correct It's just you and me or It's just you and I?

Answer 1

"It's just you and me" is correct (despite what the song says). Why? Technically, it's not a subject (to get even more technical it's a complement--not really an object, but some people will call it that). People probably use it incorrectly due to something known as hypercorrection . . . but you didn't ask about that.

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It's just you and me is correct because that is what most educated native speakers of English say. (The verb to be - am, are, is, was, were) is a copula (linking verb) and is not followed by an object. The key thing is educated usage, not rules formulated by pedantic and ill-informed grammarians.

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I would usually agree with the above paragraph, but in this case, it might be wrong. For most people, "talking right" isa matter of impression management--trying not to look dumb. Most educated people in the US will probably say "It's Just you and I." Why? As noted in the first comment, the answer is hypercorrection--people have been told so many times "Don't say 'Johnny and me' say 'Johnny and I,'" they don't know the differences based on how the phrase is used (i.e., as a subject, object, complement, or whatever) probably because of pedantic and ill-informed grammarians (or at least pedantic and ill-informed grammarians elementary and high school English teachers). Evidence to support my claim? Google reports 2.8 millions results for "Just you and me" and 157 million results for "Just you and I." Even if you take out the song results, there are a lot of educated people who say "Just you and I."