leftist-linguaphile:

tu vs. tú

Generally, “tu” only has an accent when used as a subject pronoun (you). When used as a possessive pronoun (ie. your), it does not have an accent:

• tu = your
• tú = you (informal)

Examples:

• ¿Dónde está tu carro? = Where is your car?
• Tú y yo somos amigos. = You and I are friends.

note* the formal “you” is “usted”. For more information on formal and informal “you”, click here.

(Source: political-linguaphile)