Breakdown of Se il Suo desiderio si è avverato, me lo deve dire.
suo
his/her/Your
dovere
must
se
if
dire
to say, to tell
Questions & Answers about Se il Suo desiderio si è avverato, me lo deve dire.
What exactly does lo refer to in me lo deve dire?
Here, lo is a pro-clausal pronoun. Instead of replacing a specific masculine noun, it replaces the entire preceding idea: the fact that your desire came true (che il Suo desiderio si è avverato). In English, we often translate this as "tell me so" or just drop it and say "tell me," but Italian requires the direct object pronoun lo to represent that complete thought.
Could I attach me lo to the end of dire instead?
Yes! Because deve is a modal verb (a helping verb like dovere, potere, or volere), you have two choices for pronoun placement. You can put the pronouns before the conjugated verb (me lo deve dire) or drop the final -e of the infinitive and attach them to the end (deve dirmelo). Both are perfectly correct and mean the exact same thing.
Why is Suo capitalized here?
Why do we use essere (si è) instead of avere for "came true"?