Also, there are some exceptions like some words ending in ~ia like: Comía, bebía, todavía, vía, etc. well, they have accent mark. Ther some others... but they're a bit complicated...
This is a list of exceptions, they aren't so difficult:
-Tú and Tu: Tú is You/ Tu is Your
-Mí and Mi: Mí is Me/ Mi is My
-Té and Te: Té is Tea/ Te is the Object Pronoun of Tú (I'll kill you!→ ¡Te mataré!)
-Sé and Se: Sé is conjugation of "Saber" (To know) in present tense and first singular Person (I know→ Yo sé) and is conjugation of "Ser" (To be) in imperative in second singular Person (Be strong! → ¡Sé fuerte!)/ Se is a pronoun in accusative and in dative case... is a little bit complicated... Is like... oneself, herself, himself = Se For example: Wash→Lavar; Wash oneself→Lavarse.
-Él and El: Él is personal pronoun; He/ El is masculine singular article, like The
-Dé and De: Dé is conjugation of "Dar" (To give) in subjunctive of I and He in present tense and imperative of Usted and Él-Ella/ De is a preposition that indicates belonging, like Of
-Sí and Si: Sí is Yes. Sí is a tonic pronoun too/ Si is a conjunction, like If
-Aún and Aun: Aún is still. Aun is even
-Sólo and Solo: Sólo is only. Solo is alone
-Qué, Cuándo, Dónde, Cuál, Quién, Por qué, Cómo: All of them have accent mark when they are questions or exclamations like: ¿Dónde es la fiesta? → Where is the party?; ¡Qué estúpido! → How stupid!
