"He eats rice."
Translation:Lui mangia il riso.
I'm having a hard time determining WHEN the definite article is required. "Lui mangia riso" works just as "Mangia il riso" works, just as "Lui mangia il riso" works. Is there a rule as to when the definite article is required?
The definite article is used when when the gender needs to be determined explicitly. When not used, gender is implied, In either case, both forms are correct.