Disjunctive pronouns are used independently of the verb. They are the pronouns which follow prepositions, or show emphasis.
Ello is also used as a neuter pronoun meaning it. Sí can mean yourself, himself, herself, yourselves or themselves. When con combines with mí, ti or sí, the words become conmigo, contigo and consigo. For clearness, the forms of mismo (-a, -os, -as) can be added to these pronouns.
Word Document at: 066 Spanish Disjunctive Pronouns