Nom.She or it, ella.Nom.They, ellas.
Obj. Dir.Her or it, la, se; ella, sí.Obj. Dir.Them, las, se; ellas, sí.
Obj. Ind. Her or it, le, se; ella, sí.Obj. Ind. Them, les, se; ellas, sí.
With her or it, con ella.With them, con ellas.
With herself or itself, consigo.  With themselves, consigo.

, , , are always preceded by prepositions.

Me, te, se, le, los, la, las, les, are governed by verbs, and never placed after prepositions. When the verbs are in the indicative, or in the subjunctive mood, they are placed before the verb; as, He esteems her, él la estima. Should the verb be in the infinitive, or in the imperative mood, the pronouns must be placed after it, and joined to it so as to appear one word; thus, Give it to him, (give, da, it, le, to him, se,) dásele.

POSSESSIVE PRONOUNS CONJUNCTIVE.

My, mi, mis. His, su, sus.Its, su, sus.
Thy, tu, tus. Her, su, sus.Their, su, sus.
Your, with reference to Usted, or Ustedes, su, sus.

These pronouns agree in number with the noun that follows them; as, He sold his horses, él vendió sus caballos; they fulfilled their promise, ellos cumplieron, su promesa.

POSSESSIVE PRONOUNS ABSOLUTE.

Mine, mio, mios. His, suyo, suyos.Its, suyo, suyos.
  mia, mias.   suya, suyas.  suya, suyas.
Thine, tuyo, tuyos. Hers, suyo, suyos.Theirs, suyo, suyos.
  tuya, tuyas.   suya, suyas.  suya, suyas.
Our, nuestro, nuestros. Your, vuestro, vuestros.Your, de Usted.
  nuestra, nuestras.   vuestra, vuestras.  de Ustedes.
Your, with reference to Usted, is translated also suyo, suyos, suya, suyas.

RELATIVE AND INTERROGATIVE PRONOUNS.