The pronoun "I" has three cases in English, subjective - I, objective - me, and possessive - my. The subjective and objective cases of ''you"' are identical. The subjective case is used when the pronoun in the subject of the sentence . The objective case is used when the pronoun is the object of a verb or a preposition. However, in American speech today, ''I" is frequently misused when the proper form should be "me.'' So, you'll hear "you and I" when "you and me" is the grammatically correct form (after a verb or preposition).