The answer is B: Have yo turned in you're English paper? The correct use of the pronouns are: Have you turned in your English paper? -- you (personal pronome) and your (possessive pronoun). The personal pronouns substitute that represent people: I, we, they, she, he etc. The posseve pronouns show possession: their, his, her, our etc. The sound of you're (you are) is almost like the sound of your.