Me vs. mi vs. mí

Me

  • me (first-person singular direct object pronoun)

    ¡Por favor, no me ignore! (Please don't ignore me!)
    No consigo hacer que alguien me ayude. (I can't get anyone to assist me.)

  • to me, for me (first-person singular indirect object pronoun)

    Papá me ha comprado libros. (My dad bought me books.)
    Él me dijo que ella estaba enferma. (He told me that she was sick.)

  • myself (first-person singular reflexive pronoun)

    Me aseguré de ello. (I made certain of that.)
    Me alegro de oír que no se ha resfriado a pesar del frío. (I'm glad to hear he didn't catch a cold despite the cold.)

Mi

  • my (before the noun; "mío" when after the noun)

    Eres mi rayo de sol. (You are my sunshine.)
    Mi lavadora se rompió. (My washing machine broke.)

Mí

  • me, myself (form of "me" used after prepositions)

    Tu amistad vale mucho para mí. (Your friendship has great value to me.)
    Ojalá dejases de dudar de mí. (I wish you would stop doubting me.)