There are many times when the same verb has both a direct object pronoun and indirect object pronoun. Usually, the indirect object pronoun precedes the direct object pronoun and the indirect object pronouns mi, ti, ci, and vi change to me, te, ce, and ve:
Renato porta il libro a me. (Renato brings the book to me.)
Renato me lo porta. (Renato brings it to me.)
Il professore insegna la lezione a voi. (The professor teaches the lesson to you.)
Il professore vi l'insegna. (The professor teaches you the lesson.)
For a complete chart of all the double object pronouns, see the table below.
DOUBLE OBJECT PRONOUNS
INDIRECT OBJECT
PRONOUN
LO
LA
LI
LE
NE
mi
me lo
me la
me li
me le
me ne
ti
te lo
te la
te li
te le
te ne
gli, le, Le
glielo
gliela
glieli
gliele
gliene
ci
ce lo
ce la
ce li
ce le
ce ne
vi
ve lo
ve la
ve li
ve le
ve ne
...loro
lo...loro
la...loro
li...loro
le...loro
ne...loro
Note the economy in words: gli, le, and Le become glie- before direct object pronouns and before ne, and combine with them to become one word.
From:https://www.dbfei.com/Article/yidaliyu/201311/7665.html