The first one:
A las tres, Pepe hablo con su novia por teléfono.
The second one doesn’t make much sense, it would be saying: I bought some black pants and my friend Mateo like a lot of money.
I added words in parentheses to make it make more sense:
Yo compré unos pantalones negros y (a) mi amigo mateo le gusta mucho (el) dinero.
The third one:
Después, nosotros comimos cerca de un mercado.
Before you o somewhere try and learn as much as you can about their culture. Don't want to go somewhere and the people kill you because you did something they think is terrible. Oh and learn the basics of their language
La mochila es de roberto.
I dont speak espanol ciale..