Most of the pronouns used with prepositions in Spanish are the same as the subject pronouns, but they are different in the first- and second-person singular. Otherwise their use is fairly straightforward, as indicated in the following chart.

There are two main exceptions to the above usages:

Conmigo and contigo: When used with con (usually translated as "with") the forms conmigo and contigo are used instead of con mí and con ti, respectively.

Examples: Voy contigo. ¿Vas conmigo? I'm going with you. Are you going with me?

Use of yo and tú with certain prepositions: The following six prepositions are used with the subject pronouns yo and tú instead of mí and ti, respectively: entre (usually translated as "among" or "between"), excepto ("except"), incluso ("including" or "even"), menos ("except"), salvo ("except") and según ("according to"). Also, hasta is used with the subject pronouns when it is used with roughly the same meaning as incluso.

Examples: Es la diferencia entre yo y tú. It's the difference between you and me. Muchas personas incluso/hasta yo creen en las hadas. Many people including me believe in fairies, or many people, even I, believe in fairies. Todos excepto/menos/salvo tú creen en las hadas. Everybody except you believes in fairies. Es la verdad según yo. It's the truth according to me.