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Uses of  the "se" pronoun 

The "se" form of the indirect object pronoun can either refer to a third person singular or third person plural 
when direct and indirect object pronouns are used.
(se) can be used for both.
"se" apply to itself, himself, herself, themselves.
The 'se' form is used  when the direct object pronoun is used for reasons that seem to be primarily aesthetic 
(such as the use of the 'n' with the indefinite article in English: "an apple"  vs. "a apple").
Examples
Indirect object "se"
there are many uses of 'se', and that it's not always used as an indirect object pronoun.
Direct object
Indirect object
yo le regalo un juguete a la escuela I gift a toy to the school
Yo se lo regalo I gift it to them
Yo le regalo un juguete a mi hermano I gift a toy to my brother
Yo se lo regalo I gift it to him
Examples:
Yo lavé las medias de Juan Yo se las lavé. I washed it for him.
Juan le manda la pintura a Carmen Juan se la manda Juan orders it to her
Nosotros les explicamos los motivos Nosotros se los explicamos We explain it to them.
Ellos le pagaron las entradas Ellos se las pagaron They paid it to them
Le mandé la ropa a Juan Se la mandé I ordered it to him.
Ella les regaló los chocolates a los niños Ella se los regaló She gave it to them                                                                       
As a substitute for le or les:
 When the indirect-object pronoun le or les is immediately followed by another pronoun that begins with an l,
 the le or les is changed to se, apparently as a way to avoid having two pronouns in a row beginning with the l sound. 
Dele el postre a Silvia selo a ella.  Give it to her. 
Juan le dijo el resultado a Carlos Juan se lo dijo a él.  He told it to him. 
Yo no les voy a dar los pases a los pasajeros  Yo no se los voy a dar a ellos. I'm not going to give it to them.
Using the Direct and Indirect Object Pronouns at the Same Time
Double object pronouns
We call double object pronoun if you have a direct object and an indirect object pronoun in a same sentence with the same verb, 
When you have both a direct object pronoun and an indirect object pronoun in the same sentence, the indirect object pronoun comes first.
the indirect object pronoun comes first, preceeding the direct object pronoun.
The indirect object pronouns always preceed the direct object pronoun
Direct object
Indirect object
(yo) te compro el diccionario ( a ti) I buy the dictionary to you.
(yo) te lo compro. I buy it to you.
(nosotros) les elegimos los uniformes a los jugadores We choose the uniforms for the players.
(nosotros) se los elegimos ( a ellos). We choose it for them.
(nosotros) le pedimos el libro a Marcela We ask Marcela for a book.
(nosotros) se lo pedimos ( a ella) We ask her for it. 
"se" form of the indirect object pronoun can either refer to a third person singular or plural. 
To donate-> donar
Yo dono un libro a la biblioteca. I donate a book to the library.
Yo se lo dono. I donate it to them.
Examples:
Déselo a ella.  Give it to her. 
Se lo dijo a él.  He told it to him. 
No se lo voy a dar a ellos. I'm not going to give it to them.
         

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