"He eats bread."
Translation:Lui mangia il pane.
Almost everything in every other language has an article attached to it in some shape or fashion that is used to describe what is going on in the sentence. 99% of the time, you will always include the article no matter what. "He eats some bread" will still have some conjugation of "the" mixed in there. I know in French it would be "du pain" even though it is technically "de le pain". It's just a rule that we have to follow. So, to answer your question. You pretty much always, 99.999% of the time, have to use an article that matches gender and number of the name.
This reply is definitely not correct. How do you differ in Italian language between "He eats bread" and "He eats the bread", a bread which is specified. In German "Er isst Brot", bread in general and "Er isst das Brot", a specified piece of bread? In Hebrew:
הוא אוכל לחם and הוא אוכל את הלחם
and in many other languages
It comes from the verb ending. In Italian, there are three verb endings: -are, -ere, and -ire. Each verb has its own set of conjugations corresponding to the ending (unless it's irregular). For example, you have Mangiare. Since it ends in -are, the Lui/Lei conjugation would be mangia. For the verb bevere (ends in -ere), the conjugation would be Lui/Lei beve. For the verb dormire (ends in -ire), the Lui/Lei conjugation would be dorme. Remember, not all verbs have conjugations that correspond to their endings, but MOST do.
To be clear, this phrase, 'Mangia il pane' doesn't identify that it's "He" who is eating the bread. It could be a "She". But it can ONLY be referring to one person at a time performing the act of eating bread in the present tense.
Lui mangia il pane. = He eats the bread, could also be read as, He is eating the bread.
Lei mangia il pane. = She eats the bread, could also be read as, She is eating the bread.
'Mangia il pane' relies on the context it's used in to know if it's referring to a male or female performing the present act of eating bread.