"Glielo faccio vedere io."

Translation: I'll show him.

[dnovinc]

• fare vedere = to show
• glielo = gli (a lui = to him) + lo (it) = it to him

so it can be translated as well as: "I'll show it to him" or "I am showing it to him" (they are marked as correct)

Glielo is a double object pronoun. The indirect object pronouns combined with the direct object pronouns form the double object pronouns.

more about them you can see here: http://www.cyberitalian.com/en/html/gra_prpr.html

to show = far(e) vedere, mostrare

If I'm not mistaken it's usually written as far vedere. example :

• Mi può far vedere sulla pianta?
• Mi può mostrare sulla mappa?

both sentences are translated as "Can you (formal you) show me on the map?"

EDIT: Thanks Viaggiatore, for pointing it out.

[Viaggiatore]

Glielo faccio vedere can also mean "I'll show her."

[crazy4hazy]

So, Viaggiatore... I'm sure you're right, and forgive my thickness, but how can it be also "I'll show her", if "to her" is usually "le", isn't it?

And while I'm at it, I very unimaginatively typed "gli mostrerò" - any good at all? (why is the present tense used here?) Thank you, and I'm also breathless with anticipation, to say the least... :)

[Viaggiatore]

When you have two object pronouns together before the verb, the game changes. Look here: http://italian.about.com/library/fare/blfare168a.htm One of the weirder features.

Sometimes one language uses the future where the other uses the present. "Gli mostrero'" looks fine to me.

[crazy4hazy]

Thank you, I'll try to commit this latest rule to memory (the glie.. one). As for the tense, yeah, and that's why learning another language is such fun, I guess.