"Between you and I" is an English phrase that has drawn considerable interest from linguists, grammarians, and stylists. It is commonly used by style guides as a convenient label for a construction where the nominative/subjective form of pronouns is used for two pronouns joined by and in circumstances where the accusative/oblique case would be used for a single pronoun, typically following a preposition, but also as the object of a transitive verb. One frequently cited use of the phrase occurs in Shakespeare's The Merchant of Venice (1596–98). According to many style guides, the Shakespearian character who used the phrase should have written "between you and me". Use of this common construction has been described as "a grammatical error of unsurpassable grossness", although whether it is (or was) in fact an error is a matter of debate. Source: Wikipedia (en)