Questions & Answers about Parlo del mio progetto con il mio amico.
Because del is the contraction of di + il.
- di = of/about
- il = the
- del = of the / about the
The verb parlare di means to talk about, and progetto is a masculine singular noun, so it normally takes il:
- il progetto = the project
- parlo del progetto = I talk about the project
Since mio progetto also includes the article, it becomes:
- del mio progetto = about my project
So di mio progetto would sound incomplete and ungrammatical here.
Because parlare con qualcuno means to speak/talk with someone.
In this sentence:
- parlo di... = I talk about...
- con il mio amico = with my friend
So the sentence has both:
This is a very common pattern in Italian:
- Parlo di musica con Luca. = I talk about music with Luca.
- Parliamo del film con i nostri amici. = We talk about the movie with our friends.